- VertexArray: fixed type uint -> size_t
 - fixed rotation-implementation: Sprite, Textand TileMap rotate now around their center.
 - Surface: fixed error message if Surface could not be saved.
 - Transformable: zoom default is now 1f instead of float.nan
 - Transform: new method adjustView
 - Rename: Transform.activate -> Transform.activateView ; Transform.isActive -> Transform.isViewActive