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/ATMOSPHERICS/components/unary/outlet_injector.dm

@@ -123,9 +123,9 @@
 	return 1
 
 /obj/machinery/atmospherics/unary/outlet_injector/initialize()
-	..()
-
-	set_frequency(frequency)
+	. = ..()
+	if(frequency)
+		set_frequency(frequency)
 
 /obj/machinery/atmospherics/unary/outlet_injector/receive_signal(datum/signal/signal)
 	if(!signal.data["tag"] || (signal.data["tag"] != id) || (signal.data["sigtype"]!="command"))