Graphics engine basic prototype

Adds a various assets (some of which have a TODO to change to better ones)
Sets up various screens.  We still need better buttons and stuff, but I feel it's workable.  Kinda sorta maybe, I hope.
Mocks up the two scenes, still need to be done better with better assets too
Needs to be refactored some to provide callbacks for changing / dynamic functionality, but that should be fairly easy.
Updates the version of libGDX used