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/effects/decals/contraband.dm

@@ -110,6 +110,7 @@
 			pixel_y = 0
 
 /obj/structure/sign/poster/initialize()
+	. = ..()
 	if (poster_type)
 		var/path = text2path(poster_type)
 		var/datum/poster/design = new path

code/game/objects/effects/effect_system.dm

@@ -104,7 +104,7 @@ steam.start() -- spawns the effect
 		T.hotspot_expose(1000,100)
 
 /obj/effect/effect/sparks/initialize()
-	..()
+	. = ..()
 	schedule_task_in(5 SECONDS, /proc/qdel, list(src))
 
 /obj/effect/effect/sparks/Destroy()

code/game/objects/effects/landmarks.dm

@@ -84,9 +84,9 @@
 	delete_me = 1
 
 /obj/effect/landmark/initialize()
-	..()
+	. = ..()
 	if(delete_me)
-		qdel(src)
+		return INITIALIZE_HINT_QDEL
 
 /obj/effect/landmark/Destroy(var/force = FALSE)
 	if(delete_me || force)

code/game/objects/effects/misc.dm

@@ -34,6 +34,7 @@
 	pixel_y = -32
 
 /obj/effect/temporary_effect/cleave_attack/initialize() // Makes the slash fade smoothly. When completely transparent it should qdel itself.
+	. = ..()
 	animate(src, alpha = 0, time = time_to_die - 1)
 
 /obj/effect/temporary_effect/shuttle_landing
@@ -44,4 +45,4 @@
 
 /obj/effect/temporary_effect/shuttle_landing/initialize()
 	flick("shuttle_warning", src) // flick() forces the animation to always begin at the start.
-	..()
+	. = ..()

code/game/objects/effects/step_triggers.dm

@@ -129,6 +129,7 @@
 	var/landmark_id = null
 
 /obj/effect/step_trigger/teleporter/landmark/initialize()
+	. = ..()
 	for(var/obj/effect/landmark/teleport_mark/mark in tele_landmarks)
 		if(mark.landmark_id == landmark_id)
 			the_landmark = mark