feat(minecraft-server): replace environment variables in configs

Add additional setup script that replaces environment variables inside
config files.

Closes #298

minecraft-server/start-finalSetup04ServerProperties

@@ -132,4 +132,4 @@ else
   echo "server.properties already created, skipping"
 fi
 
-exec /start-minecraftFinalSetup $@
+exec /start-finalSetup05EnvVariables $@