Added spritehandler module.

It doesn't quite work yet, so all is well.
Changed file format of README.
Changed animset names for consistency.
Removed common.py because wtf?
Removed Actor.make_animations() because that's not how animations work now.
Changed animated objects in preparation for full animset implementation.
AnimatedGameObject, etc.
Removed some collision junk.
Cleaned up some old garbage.
Added a font.
More work on the new sprite handling.
Still doesn't work.
Split despawn method in two.
Moved GameMenu to its own file. Added MenuObjects.
(Basically GameObjects for menus.)
Removed super-widescreen thingy from debug mode for now.
Implemented the new menu screen to a… functional degree.
More remains to be done. Mañana.
Added logging to menu.py.
Updated Props to work with the new sprite handler.
Actors… not so much.
Added logging for total sprite count.
Removed some junk code.
Removed a bunch of old code from the Actor class.