Restructured file stuff a bit to make each individual screen its own file. Also readded clock functionality.
 Changes to be committed:
	modified:   src/MHMC.hs
	modified:   src/MHMC/Display.hs
	renamed:    src/MHMC/Clock.hs -> src/MHMC/Display/Clock.hs
	new file:   src/MHMC/Display/Help.hs