* Added some new physics functions
* Added new documentation
* Added some auto checks for OS to rc_os_defines.h
* Fixed bugs on settting and getting position of sprites
Finished documentation on sprite physics and joints
Fixed some bugs in sprite physics
Added safety checks for joint types
Added code to free up joints when a canvas is destroyed
* Finished working on tiling
* Changed how sprite layers work. Sprite layers are now not confined to the limits of the actual canvas but instead will decide where to draw each sprite based on the canvas offset and the sprites location
