Removed magic constants in DrawPieces

Now they're named constants in GoBoard.h
Admittedly, they're not particularly less magic now,
just named.
Retrofitted DrawPieces to use GoBoard
Added almost mouse drawing.
Merge branch 'master' of https://github.com/benstreb/Gorilla

Conflicts:
	GoBoard.cpp
	GoBoard.h
	mesh.h
	render.cpp
Removed some crap.
Made some fixes.

Also, you can actually place pieces now.