* Fixed bug that would cause the renderer for sprites to be corrupted on when the sprite vector is resized
* Changed deleted_sprites variable to deleted_animation in sprite object
* Changed sprite pointer vector to sprite id vector in canvas object
* Changed the value stored in Fixture UserData pointer to sprite id rather than sprite pointer because pointer would change on resize anyway
* 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
