Fix mem-leak bug in scanMap; mod jump macros.

Mod:
	src/termcrate.h
		-mod movement macros (gravity delay, velocities) for greater
		playability.

Fix:
	src/graphics.c
		-fix bug caused by the while(fgets(...)); one-liner in
		scanMap(), which catalyzed a memory-leak that overwrote
		_gameLost (which, no longer set to 0, wasn't falsy) and caused
		game() in src/termcrate.c to terminate. Implemented hard-looping
		MAP_HEIGHT times by incrementing a row variable and performing a
		conditional check.