Crawler Crew

+ Added Cannon Enemy
+ Reworked and added Physics based movement scheme. Tanks can now drift.
+ Added simple working Enemy AI
+ Refactored GameManager and all related scripts (FX, SFX, Debug, Controls)
+ New DesignDoc specific to RPG mechanics
+ Recruited DevFriend to help me set up the RPG aspects of the game
+ Set up GIT repo
- Was sick home from work. Hence see above.

+ Level generation code finished for now
+ New Spider Bot enemy
+ Began work on bitmasking
- Spider Bots needs animations

+ New Sand and Jungle sprites
+ Added shell-eject animation
+ Added multiple level generator object support
- Progress is slow.