Tiles are now (mostly) pooled objects (#19112)

* Tiles are now (mostly) pooled objects

Floors no longer have a builtin_tile, but instead use PoolOrNew().

Also added a do-nothing SSpool so you can inspect the global pool.

* Entries for time keeping

* MORE STATISTICS

* Stat tracking, auto filling

* Code review I

* Code review II

* Code review III

code/game/objects/items/stacks/sheets/light.dm

@@ -29,7 +29,7 @@
 		var/obj/item/stack/sheet/metal/M = O
 		if (M.use(1))
 			use(1)
-			var/obj/item/stack/tile/light/L = new (user.loc)
+			var/obj/item/L = PoolOrNew(/obj/item/stack/tile/light, user.loc)
 			user << "<span class='notice'>You make a light tile.</span>"
 			L.add_fingerprint(user)
 		else

code/game/objects/items/stacks/tiles/tile_types.dm

@@ -18,6 +18,10 @@
 	pixel_x = rand(-3, 3)
 	pixel_y = rand(-3, 3) //randomize a little
 
+/obj/item/stack/tile/Destroy()
+	..()
+	return QDEL_HINT_PUTINPOOL
+
 /obj/item/stack/tile/attackby(obj/item/W, mob/user, params)
 
 	if (istype(W, /obj/item/weapon/weldingtool))

code/game/objects/items/weapons/storage/backpack.dm

@@ -285,7 +285,7 @@
 
 /obj/item/weapon/storage/backpack/satchel_flat/New()
 	..()
-	new /obj/item/stack/tile/plasteel(src)
+	PoolOrNew(/obj/item/stack/tile/plasteel, src)
 	new /obj/item/weapon/crowbar(src)
 
 /obj/item/weapon/storage/backpack/dufflebag