Normalize whitespace in source files

Ensure that no source files have trailing whitespace at end of lines and ensure that all files end with a single trailing newline.

This also adds Github Actions to enforce whitespace conventions.

src-ui/src/app/pipes/file-size.pipe.ts

@@ -1,6 +1,6 @@
 /**
  * https://gist.github.com/JonCatmull/ecdf9441aaa37336d9ae2c7f9cb7289a
- * 
+ *
  * @license
  * Copyright (c) 2019 Jonathan Catmull.
  *

src-ui/src/app/pipes/safe.pipe.ts

@@ -16,4 +16,4 @@ export class SafePipe implements PipeTransform {
     }
   }
 
-} 
+}