Do some cleanup before packaging for release

[dodexahedron]

There's still some stuff in there that was originally planned for the extension generator, but which has since been re-planned to be in a separate generator that creates complete replacement types for enums, as well as other little bits and pieces that either never got used or that the refactor to make it project-agnostic has made obsolete.

I'm going to do a bit of cleanup on that before packing it for release.