Menu System

Modified menu controller to allow different actions when selected.
Currently, New Game, Continue, and Options all take the player to a new
screen (which are currently blank).

Will work on the options screen next.
Merge remote-tracking branch 'origin/master'

Conflicts:
	MythosMan.gmx/MythosMan.project.gmx
	MythosMan.gmx/objects/obj_menucontrol.object.gmx