Add color; stop enemies from falling through surf.

Add:
	.gitignore
		-add makefile (as developers' compilation requirements vary).
Mod:
	src/graphics.h
		-add MAP_BUF_WIDTH (equal to MAP_WIDTH + 2), used specifically
		by functions that require the extended MAP_WIDTH (whenever
		handling the mapBuf matrix).
		-restore original MAP_WIDTH value.

	termcrate/graphics.c
		-amend onSurface() conditional, to prevent enemies from falling
		through surfaces.