** Added methods to retrieve texture data for keyframes, animations, and animated sprites.
** Added texture data indexer to KeyFrame. Texture data is cached.
** Changed texture data access functions in Animation and AnimatedSprite to KeyFrame access functions.
** Rolled back to previous commit.
** Added static class TextureHelper.
** Changed FrameData() function names to TextureData().
** Implemented KeyFrame's TextureData() using TextureHelper.
** Added AlphaData() to TextureHelper.
** Renamed TextureHelper.TextureData() to ColorData().
** Renamed AnimatedSprite's TextureData() to CollisionData().
** Renamed Animation's GetCurrentKeyFrame() to CurrentKeyFrame().
** Removed TextureData() from Animation.
** AnimatedSprite now caches CollisionData().