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/machinery/embedded_controller/airlock_controllers.dm

@@ -13,7 +13,7 @@
 	var/tag_secure = 0
 
 /obj/machinery/embedded_controller/radio/airlock/initialize()
-	..()
+	. = ..()
 	program = new/datum/computer/file/embedded_program/airlock(src)
 
 //Advanced airlock controller for when you want a more versatile airlock controller - useful for turning simple access control rooms into airlocks