Importing hasn't been supported in years...

This is just an excuse to remove crufty import code. Largely untested
stale codepaths are really not good for any project. Especially not one as
insane as this one is.
Begin new cPRP helper module
Add a profiling export mode

The new mode encapsulates Generate Release (ideally the slowest export
mode) inside a cProfile call. It then dumps human-readable stats so that
users can profile their exports and send them to a developer.
Improve texture loading slightly

We now load textures using PIL from their locations on the disk. If they
are packed, we unpack them into a temporary file. Future directions
include further reducing the scope of cStringIO usage in the texture
processor.
Slightly less cStringIO...