[Bug] Quads were rendering as 'triangles' due to a typo in the last commit.
[Change] Changed 'Offset' to 'QuadOrigin' so it's more clearer to understand; 0,0 is at the top left corner of the screen.
[Change] Colour and the QuadOrigin are now reset to their default values; white and 0,0 when Layer.Begin() is called.