Adds overmap system and examples of it's usage.

Unticked, as it disables space edge transition.

Conflicts:
	code/modules/mob/mob_movement.dm

code/modules/mob/mob_movement.dm

@@ -256,6 +256,10 @@
 		if(istype(mob.buckled, /obj/vehicle) || istype(mob.buckled, /obj/structure/stool/bed/chair/cart))
 			return mob.buckled.relaymove(mob,direct)
 
+		if(istype(mob.machine, /obj/machinery))
+			if(mob.machine.relaymove(mob,direct))
+				return
+
 		if(mob.pulledby || mob.buckled) // Wheelchair driving!
 			if(istype(mob.loc, /turf/space))
 				return // No wheelchair driving in space