for(var/bad_code in world)

Removes a very large amount of world loops.
Adds a macro to painlessly generate a global list, and the needed code to modify the list when an object is made or deleted automatically.
Cleans up some commented out code.

code/game/objects/structures/crates_lockers/closets/secure/security.dm

@@ -319,7 +319,7 @@
 		new /obj/item/weapon/reagent_containers/syringe/ld50_syringe/choral(src)
 		return
 
-
+GLOBAL_LIST_BOILERPLATE(all_brig_closets, /obj/structure/closet/secure_closet/brig)
 
 /obj/structure/closet/secure_closet/brig
 	name = "brig locker"

code/game/objects/structures/janicart.dm

@@ -1,3 +1,5 @@
+GLOBAL_LIST_BOILERPLATE(all_janitorial_carts, /obj/structure/janitorialcart)
+
 /obj/structure/janitorialcart
 	name = "janitorial cart"
 	desc = "The ultimate in janitorial carts! Has space for water, mops, signs, trash bags, and more!"

code/game/objects/structures/mop_bucket.dm

@@ -10,6 +10,7 @@
 	flags = OPENCONTAINER
 	var/amount_per_transfer_from_this = 5	//shit I dunno, adding this so syringes stop runtime erroring. --NeoFite
 
+GLOBAL_LIST_BOILERPLATE(all_mopbuckets, /obj/structure/mopbucket)
 
 /obj/structure/mopbucket/New()
 	create_reagents(300)

code/game/objects/structures/morgue.dm

@@ -196,6 +196,8 @@
  * Crematorium
  */
 
+GLOBAL_LIST_BOILERPLATE(all_crematoriums, /obj/structure/morgue/crematorium)
+
 /obj/structure/morgue/crematorium
 	name = "crematorium"
 	desc = "A human incinerator. Works well on barbeque nights."
@@ -342,7 +344,7 @@
 	if(..())
 		return
 	if(src.allowed(user))
-		for (var/obj/structure/morgue/crematorium/C in world)
+		for (var/obj/structure/morgue/crematorium/C in all_crematoriums)
 			if (C.id == id)
 				if (!C.cremating)
 					C.cremate(user)