General Polish Push

-Added many comments for clarity
-Update self.empty for Coordinate objects when removing elements
-change Matter class objects to supply generic name based on imageKey
-Removed XeroInit as most of its functionality had moved to
ImageManifests and the rest could be put into main.py
-Changed to *args in World.activateChunk and World.deactivateChunk
-Remove origin as a parameter of worldView as it is alread in the shape
argument if it is needed at all