SpriteKit Rendering

• Overhauls game rendering to use SpriteKit Textures instead of Core Graphics, resulting in significant performance and graphics improvements
• Removes automatic saving and loading, which was resulting in the majority of crashes when selecting a game. They have been moved to the force touch menu, but are still buggy. Will require investigation.

Giovanni Alpha

Serves as a public prototype. Crashes exist on device and performance can be improved.