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/random/random.dm

@@ -979,7 +979,7 @@ var/list/multi_point_spawns
 	var/weight // Probability weight for this spawn point
 
 /obj/random_multi/initialize()
-	..()
+	. = ..()
 	weight = max(1, round(weight))
 
 	if(!multi_point_spawns)