* Stored base offsets and vertices in sprite structure
* Calculated the average of vertices in polygon and chain shapes and used that as center
* Applied offsets to drawSprites()
* 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 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
* Changed the names of some of the functions
* Added functions for setting and returning the projection matrix of the active camera
* Added a function for getting the 2D screen coordinates from a 3D vector
* Added documentation for all the new functions
* Added collision callback
* Set sprite density to 1 by default
* Added default frame value of 0 on frame resize
* Changed defaults for sprite fixture
* Made changes to some of the animation functions parameters
