diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ab8de30..3e0deb5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,43 +1,315 @@
-name: C++ CI
+name: CI
 
 on: push
 
-env:
-  BUILD_TYPE: Release
-
 jobs:
-  test:
+  ci:
+    name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}
+
+    env:
+      CMAKE_GENERATOR: Ninja
+
     strategy:
+      fail-fast: false
       matrix:
-        os: [
-          ubuntu-latest,
-          ubuntu-16.04,
-          windows-latest,
-          windows-2016,
-          macos-latest
+        # Github Actions requires a single row to be added to the build matrix.
+        # See https://help.github.com/en/articles/workflow-syntax-for-github-actions.
+        name: [
+          ubuntu-18.04-gcc-4.8,
+          ubuntu-18.04-gcc-4.9,
+          ubuntu-18.04-gcc-5,
+          ubuntu-18.04-gcc-6,
+          ubuntu-18.04-gcc-7,
+          ubuntu-18.04-gcc-8,
+          ubuntu-18.04-gcc-9,
+          ubuntu-18.04-clang-3.5,
+          ubuntu-18.04-clang-3.6,
+          ubuntu-18.04-clang-3.7,
+          ubuntu-18.04-clang-3.8,
+          ubuntu-18.04-clang-3.9,
+          ubuntu-18.04-clang-4.0,
+          ubuntu-18.04-clang-5.0,
+          ubuntu-18.04-clang-6.0,
+          ubuntu-18.04-clang-7,
+          ubuntu-18.04-clang-8,
+          ubuntu-18.04-clang-9,
+          windows-2016-cl,
+          windows-2016-clang-cl,
+          windows-2016-clang,
+          windows-2016-gcc,
+          windows-2019-cl,
+          windows-2019-clang-cl,
+          windows-2019-clang,
+          windows-2019-gcc,
+          macOS-10.14-xcode-9.4.1,
+          macOS-10.14-xcode-10.0,
+          macOS-10.14-xcode-10.1,
+          macOS-10.14-xcode-10.2,
+          macOS-10.14-xcode-10.2.1,
+          macOS-10.14-xcode-10.3,
+          macOS-10.14-gcc-7,
+          macOS-10.14-gcc-8,
+          macOS-10.14-gcc-9,
         ]
 
+        include:
+          - name: ubuntu-18.04-gcc-4.8
+            os: ubuntu-18.04
+            compiler: gcc
+            version: "4.8"
+
+          - name: ubuntu-18.04-gcc-4.9
+            os: ubuntu-18.04
+            compiler: gcc
+            version: "4.9"
+
+          - name: ubuntu-18.04-gcc-5
+            os: ubuntu-18.04
+            compiler: gcc
+            version: "5"
+
+          - name: ubuntu-18.04-gcc-6
+            os: ubuntu-18.04
+            compiler: gcc
+            version: "6"
+
+          - name: ubuntu-18.04-gcc-7
+            os: ubuntu-18.04
+            compiler: gcc
+            version: "7"
+
+          - name: ubuntu-18.04-gcc-8
+            os: ubuntu-18.04
+            compiler: gcc
+            version: "8"
+
+          - name: ubuntu-18.04-gcc-9
+            os: ubuntu-18.04
+            compiler: gcc
+            version: "9"
+
+          - name: ubuntu-18.04-clang-3.5
+            os: ubuntu-18.04
+            compiler: clang
+            version: "3.5"
+
+          - name: ubuntu-18.04-clang-3.6
+            os: ubuntu-18.04
+            compiler: clang
+            version: "3.6"
+
+          - name: ubuntu-18.04-clang-3.7
+            os: ubuntu-18.04
+            compiler: clang
+            version: "3.7"
+
+          - name: ubuntu-18.04-clang-3.8
+            os: ubuntu-18.04
+            compiler: clang
+            version: "3.8"
+
+          - name: ubuntu-18.04-clang-3.9
+            os: ubuntu-18.04
+            compiler: clang
+            version: "3.9"
+
+          - name: ubuntu-18.04-clang-4.0
+            os: ubuntu-18.04
+            compiler: clang
+            version: "4.0"
+
+          - name: ubuntu-18.04-clang-5.0
+            os: ubuntu-18.04
+            compiler: clang
+            version: "5.0"
+
+          - name: ubuntu-18.04-clang-6.0
+            os: ubuntu-18.04
+            compiler: clang
+            version: "6.0"
+
+          - name: ubuntu-18.04-clang-7
+            os: ubuntu-18.04
+            compiler: clang
+            version: "7"
+
+          - name: ubuntu-18.04-clang-8
+            os: ubuntu-18.04
+            compiler: clang
+            version: "8"
+
+          - name: ubuntu-18.04-clang-9
+            os: ubuntu-18.04
+            compiler: clang
+            version: "9"
+
+          - name: windows-2016-cl
+            os: windows-2016
+            compiler: cl
+
+          - name: windows-2016-clang-cl
+            os: windows-2016
+            compiler: clang-cl
+
+          - name: windows-2016-clang
+            os: windows-2016
+            compiler: clang
+
+          - name: windows-2019-cl
+            os: windows-2019
+            compiler: cl
+
+          - name: windows-2016-gcc
+            os: windows-2016
+            compiler: gcc
+
+          - name: windows-2019-clang-cl
+            os: windows-2019
+            compiler: clang-cl
+
+          - name: windows-2019-clang
+            os: windows-2019
+            compiler: clang
+
+          - name: windows-2019-gcc
+            os: windows-2019
+            compiler: gcc
+
+          - name: macOS-10.14-xcode-9.4.1
+            os: macOS-10.14
+            compiler: xcode
+            version: "9.4.1"
+
+          - name: macOS-10.14-xcode-10.0
+            os: macOS-10.14
+            compiler: xcode
+            version: "10"
+
+          - name: macOS-10.14-xcode-10.1
+            os: macOS-10.14
+            compiler: xcode
+            version: "10.1"
+
+          - name: macOS-10.14-Xcode-10.2
+            os: macOS-10.14
+            compiler: xcode
+            version: "10.2"
+
+          - name: macOS-10.14-xcode-10.2.1
+            os: macOS-10.14
+            compiler: xcode
+            version: "10.2.1"
+
+          - name: macOS-10.14-xcode-10.3
+            os: macOS-10.14
+            compiler: xcode
+            version: "10.3"
+
+          - name: macOS-10.14-gcc-7
+            os: macOS-10.14
+            compiler: gcc
+            version: "7"
+
+          - name: macOS-10.14-gcc-8
+            os: macOS-10.14
+            compiler: gcc
+            version: "8"
+
+          - name: macOS-10.14-gcc-9
+            os: macOS-10.14
+            compiler: gcc
+            version: "9"
+
     steps:
-    - uses: actions/checkout@v1
+      - uses: actions/checkout@v1
 
-    #- name: Install Dependencies
-    #  env:
-    #    dependency_packages: build-essential g++-5
-    #  run: sudo apt-get update && sudo apt-get -y install ${dependency_packages}
+      - name: Install (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          # CMake 3.15 allows specifying the generator using the CMAKE_GENERATOR
+          # environment variable.
+          curl -sSL https://github.com/Kitware/CMake/releases/download/v3.15.4/cmake-3.15.4-Linux-x86_64.tar.gz -o cmake.tar.gz
+          sudo tar xf cmake.tar.gz --strip 1 -C /usr/local
+          # Required for libc6-dbg:i386 and g++-multilib packages which are 
+          # needed for x86 builds.
+          sudo dpkg --add-architecture i386
+          # clang-3.7 and earlier are not available in Bionic anymore so we get
+          # them from the Xenial repositories instead.
+          sudo add-apt-repository "deb http://dk.archive.ubuntu.com/ubuntu/ xenial main"
+          sudo add-apt-repository "deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe"
+          
+          # LLVM 9 is not in Bionic's repositories so we add the official LLVM repository.
+          if [ "${{ matrix.compiler }}" = "clang" ] && [ "${{ matrix.version }}" = "9" ]; then
+            sudo add-apt-repository "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-9 main"
+          fi
+          sudo apt-get update
+          # libc6-dbg:i386 is required for running valgrind on x86.
+          sudo apt-get install -y ninja-build valgrind libc6-dbg:i386
+          if [ "${{ matrix.compiler }}" = "gcc" ]; then
+            sudo apt-get install -y g++-${{ matrix.version }} g++-${{ matrix.version }}-multilib
+            echo "::set-env name=CC::gcc-${{ matrix.version }}"
+            echo "::set-env name=CXX::g++-${{ matrix.version }}"
+          else
+            sudo apt-get install -y clang-${{ matrix.version }} g++-multilib
+            echo "::set-env name=CC::clang-${{ matrix.version }}"
+            echo "::set-env name=CXX::clang++-${{ matrix.version }}"
+          fi
+      
+      - name: Install (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          brew install cmake ninja
+          if [ "${{ matrix.compiler }}" = "gcc" ]; then
+            brew install gcc@${{ matrix.version }}
+            echo "::set-env name=CC::gcc-${{ matrix.version }}"
+            echo "::set-env name=CXX::g++-${{ matrix.version }}"
+          else
+            sudo xcode-select -switch /Applications/Xcode_${{ matrix.version }}.app
+            echo "::set-env name=CC::clang"
+            echo "::set-env name=CXX::clang++"
+          fi
+      
+      - name: Install (Windows)
+        if: runner.os == 'Windows'
+        shell: powershell
+        run: |
+          Invoke-Expression (New-Object System.Net.WebClient).DownloadString('https://get.scoop.sh')
+          scoop install ninja --global
+          if ("${{ matrix.compiler }}".StartsWith("clang")) {
+            scoop install llvm --global
+          }
+          if ("${{ matrix.compiler }}" -eq "gcc") {
+            # Chocolatey GCC is broken on the windows-2019 image.
+            # See: https://github.com/DaanDeMeyer/doctest/runs/231595515
+            # See: https://github.community/t5/GitHub-Actions/Something-is-wrong-with-the-chocolatey-installed-version-of-gcc/td-p/32413
+            scoop install gcc --global
+            echo "::set-env name=CC::gcc"
+            echo "::set-env name=CXX::g++"
+          } elseif ("${{ matrix.compiler }}" -eq "clang") {
+            echo "::set-env name=CC::clang"
+            echo "::set-env name=CXX::clang++"
+          } else {
+            echo "::set-env name=CC::${{ matrix.compiler }}"
+            echo "::set-env name=CXX::${{ matrix.compiler }}"
+          }
+          # Scoop modifies the PATH so we make the modified PATH global.
+          echo "::set-env name=PATH::$env:PATH"
+      
+      - name: Configure
+        if: runner.os == 'Windows'
+        run: .github\workflows\vsenv.bat -arch=x64 -host_arch=x64
 
-    - name: Create Build Environment
-      run: cmake -E make_directory ${{runner.workspace}}/inja/build
-
-    - name: Build
-      working-directory: ${{runner.workspace}}/inja/build
-      shell: bash
-      run: |
-        cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
-        cmake --build . --config $BUILD_TYPE -j4
-
-    - name: Test
-      working-directory: ${{runner.workspace}}/inja/build
-      shell: bash
-      run: |
-        ctest -C $BUILD_TYPE -V
+      - name: Build & Test Debug
+        run: |
+          cmake -E remove_directory build
+          cmake -B build -S . -DCMAKE_BUILD_TYPE=Debug
+          cmake --build build -j2
+          cd build && ctest -j2 --output-on-failure
+        
+      - name: Build & Test Release
+        run: |
+          cmake -E remove_directory build
+          cmake -B build -S . -DCMAKE_BUILD_TYPE=Release
+          cmake --build build -j2
+          cd build && ctest -j2 --output-on-failure
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 77c994e..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,85 +0,0 @@
-language: cpp
-dist: trusty
-sudo: required
-
-matrix:
-  include:
-    - os: linux
-      compiler: gcc
-      env: COMPILER=g++-5
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: g++-5
-
-    - os: linux
-      compiler: gcc
-      env: COMPILER=g++-6
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test']
-          packages: g++-6
-
-    - os: linux
-      compiler: gcc
-      env:
-        - COMPILER=g++-7
-        - DOCS="true"
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-7
-
-    - os: linux
-      compiler: gcc
-      env:
-        - COMPILER=g++-8
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-8
-
-    - os: linux
-      compiler: gcc
-      env:
-        - COMPILER=g++-8
-        - CXXFLAGS=-std=c++17
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-8
-
-    - os: linux
-      compiler: clang
-      env: COMPILER=clang++-5.0
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
-          packages: ['clang-5.0', 'libstdc++-7-dev']
-
-    - os: linux
-      compiler: clang
-      env: COMPILER=clang++-6.0
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-6.0']
-          packages: ['clang-6.0', 'libstdc++-7-dev']
-
-    - os: osx
-      osx_image: xcode9
-
-    - os: osx
-      osx_image: xcode10
-
-
-script:
-  - if [[ "${COMPILER}" != "" ]]; then export CXX=${COMPILER}; fi
-  - uname -a
-  - $CXX --version
-
-  - mkdir -p build
-  - cd build
-  - cmake -DCMAKE_BUILD_TYPE=Release ..
-  - cmake --build . -- VERBOSE=1 -j4
-  - ctest -V
-  - cd ..
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100755
index 33ace31..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,43 +0,0 @@
-version: '{build}'
-
-image:
-  - Visual Studio 2019
-
-platform:
-  - Win32
-  - x64
-
-configuration:
-  - Debug
-  - Release
-
-environment:
-  matrix:
-    # Visual Studio 2015
-    - TOOLCHAIN: v140
-      STD: 14
-    # Visual Studio 2017
-    - TOOLCHAIN: v141
-      STD: 14
-    - TOOLCHAIN: v141
-      STD: 17
-    # Visual Studio 2019
-    - TOOLCHAIN: v142
-      STD: 14
-    - TOOLCHAIN: v142
-      STD: 17
-
-init:
-  - cmake --version
-  - msbuild /version
-
-before_build:
-  - mkdir -p build
-  - cd build
-  - cmake .. -A %PLATFORM% -T %TOOLCHAIN% -DCMAKE_CXX_STANDARD=%STD%
-
-build_script:
-  - cmake --build . --config %CONFIGURATION% -- -verbosity:n
-
-test_script:
-  - ctest -C %CONFIGURATION% -V -j