Add somewhat-functional crates; still debugging.

Add:
	src/termcrate.c
		-resetCrate() resets _crate position and contained weapon
		after it has been acquired by the player.
		-crateCollision() checks for player collision with crate.
		Created for brevity's sake, as it contains three lines and is
		called from three separate movement functions.

	src/graphics.c
		-render _crate
Merge branch 'master' of https://github.com/sevko/termcrate

Conflicts:
	src/termcrate.c
	src/termcrate.h