Testing non-xhr loader with Fil
more robust error handling.
Combine XHR + script injection technqieues to load the plugins list (either .json or .js file).
moved plugin loader script injection to a function so it can also be called when xhr fails just because the json file is not present.
[All] [CB-3941] [CB-3940] packaging was failing if pkg existed but pkg/debug did not.  Fixed whitespace difference between build platforms