Dither the outline of the player

Test bg grid with outlined player

More bitmap tests

Update snake to use some new API, and add a test game for testing bitmap stuff

Split the 1bit tilesheets into sprites

Some assets

Added the cart files for our snake game (do we want to ignore game.bin and game.dll?)

Ignore Makefiles too

Don't put a Makefile here, we have a template in the cneboy repo

Initial commit with snake game, and external build