Unity Character Animation

Generate CharacterSpriteSheet objects that can be used to easily get a sprite generator to show the animated sprites:

Refactored the project again to remove some assemblies, removed the .net Image outputs to focus only on Unity (adding this back from Git history, should be easy if anyone ever needs this).

This should be the last feature release, I am using this in one of my projects and will continue to fix bugs and improve performance as I find issues.