Updates the atom_pool, now datum_pool, to handle any datum object.

Makes the garbage collector similarly robust. Continues the whole Destroy/qdel porting.

code/datums/helper_datums/construction_datum.dm

@@ -12,7 +12,7 @@
 		holder = atom
 		if(!holder) //don't want this without a holder
 			spawn
-				del src
+				qdel(src)
 		set_desc(steps.len)
 		return
 
@@ -61,7 +61,7 @@
 		if(result)
 			new result(get_turf(holder))
 			spawn()
-				del holder
+				qdel(holder)
 		return
 
 	proc/set_desc(index as num)

code/datums/helper_datums/teleport.dm

@@ -49,7 +49,7 @@
 	//must succeed in most cases
 	proc/setTeleatom(atom/movable/ateleatom)
 		if(istype(ateleatom, /obj/effect) && !istype(ateleatom, /obj/effect/dummy/chameleon))
-			del(ateleatom)
+			qdel(ateleatom)
 			return 0
 		if(istype(ateleatom))
 			teleatom = ateleatom