Hygiene: Allow MFResourceLoaderModule to handle templates and files

* In debug mode use a load.php url if templates or parsed messages
are present
* Make all our modules use MFResourceLoaderModule
* Remove the need for plumbing modules

Change-Id: I02ae1476c1ce9cdf877e2ba24c17db6c26800011
Merge "Hygiene: Allow MFResourceLoaderModule to handle templates and files"