Update every initialize() proc to return an initialize hint.

* Yes, all of them.
* Also did a few corrections to redundant New() and broken Destroy() along the way
* Renamed the turf_initializer.initialize() proc to InitializeTurf to avoid confusion.
* Subsumed /area/proc/initialize into /atom/proc/initialize() - Made /area's LateInitialize to get same behavior as before.

code/modules/multiz/open_space_controller.dm

@@ -61,12 +61,6 @@
 			add_turf(T)
 	open_space_initialised = TRUE
 
-/turf/simulated/open/initialize()
-	. = ..()
-	if(open_space_initialised)
-		// log_debug("[src] ([x],[y],[z]) queued for update for initialize()")
-		OS_controller.add_turf(src)
-
 /turf/Entered(atom/movable/AM)
 	. = ..()
 	if(open_space_initialised && !AM.invisibility && isobj(AM))