Remove grid-lock from player

[FlamerShaftglutton]

The player is no longer a griddle thanks to #1. But it was intentionally logically locked to the grid. Removing this largely just requires updating the get_face_square and get_faced_griddle functions on the player. The rest of the changes should be easy.

[FlamerShaftglutton]

Note that this will require controller input or capturing multiple keys at once.

[FlamerShaftglutton]

Capturing multiple key inputs is done, but not controller input, which is what I'd prefer.