fixed problem with multiple tilesets, added in support for drawing collision boxes from tmx
collision types are now global
added support for parsing objects from tmx
fixed player collisions with platforms
added physics to sprites in child class, textures.py is becoming redundant
edited comments
implements global collision types to remove hardcoded numbers
implements global collision types to remove hardcoded numbers
implements global collision types to remove hardcoded numbers
changed level design for testing