Revert "optimize crew monitor's scan()"

This reverts commit 8e245f527db4a00088fc2b7b8576fadc11875a6a.

Conflicts:
	code/__HELPERS/global_lists.dm
	code/modules/clothing/clothing.dm

code/__HELPERS/global_lists.dm

@@ -22,7 +22,6 @@ var/global/list/side_effects = list()				//list of all medical sideeffects types
 var/global/list/mechas_list = list()				//list of all mechs. Used by hostile mobs target tracking.
 var/global/list/joblist = list()					//list of all jobstypes, minus borg and AI
 var/global/list/flag_list = list()					//list of flags during Nations gamemode
-var/global/list/clothing_list = list()					//list of all /obj/item/clothing instances in the world
 
 //Languages/species/whitelist.
 var/global/list/all_species[0]
@@ -111,7 +110,6 @@ var/global/list/backbaglist = list("Nothing", "Backpack", "Satchel", "Satchel Al
 		var/datum/language/L = new T
 		all_languages[L.name] = L
 
-
 	var/rkey = 0
 	paths = typesof(/datum/species)-/datum/species
 	for(var/T in paths)

code/game/machinery/computer/crew.dm

@@ -108,7 +108,13 @@
 
 
 /obj/machinery/computer/crew/proc/scan()
-	for(var/obj/item/clothing/under/C in clothing_list)
+	for(var/obj/item/clothing/under/C in world)
 		if((C.has_sensor) && (istype(C.loc, /mob/living/carbon/human)))
-			tracked |= C
-	return 1
+			var/check = 0
+			for(var/O in src.tracked)
+				if(O == C)
+					check = 1
+					break
+			if(!check)
+				src.tracked.Add(C)
+	return 1

code/modules/clothing/clothing.dm

@@ -2,14 +2,6 @@
 	name = "clothing"
 	var/list/species_restricted = null //Only these species can wear this kit.
 
-/obj/item/clothing/New()
-	. = ..()
-	clothing_list += src
-
-/obj/item/clothing/Del()
-	clothing_list -= src
-	return ..()
-
 //BS12: Species-restricted clothing check.
 /obj/item/clothing/mob_can_equip(M as mob, slot)