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/game/objects/structures/railing.dm

@@ -24,7 +24,7 @@
 		verbs += /obj/structure/proc/climb_on
 
 /obj/structure/railing/initialize()
-	..()
+	. = ..()
 	if(src.anchored)
 		update_icon(0)