Progress: Begin adding FSS Payload processing code.

Progress: Begin adding FSS Payload processing code.

This will use the f_abstruse project.
This is very incomplete and is mostly drafted out.

Update the Featureless Make stand alone build with the latest changes.

Apply the related cleanups from 4ced1b0ba41334ce94d0a9b511b363a6031da136 (Cleanup: Have enumeration types support "none" and have the "// enum" comment at the end.).

Add some documentation comments.