Refactor sprite rendering; rename scanMap>loadMap.

Ref:
	src/graphics.h
		-define Color and Sprite macro for each element struct.

	src/graphics.c
		-replace struct-specific rendering functions with a generic
		drawSprite(char * sprite, char * color); arguments are
		sprite/color macros from src/graphics.h.
		-rename scanMap as loadMap, for likeness with loadElements.

	src/termcrate.c
		-rename scanMap.