Steals and fixes a memory leak fix from the freeloaders

-Up-ports a memory leak fix related to preview mannequins.
-Also fixes the forementioned fix breaking fuzzy/sharp previews on setup.
-Also makes the fuzzy/sharp toggle button update the char setup preview.

code/_helpers/global_lists.dm

@@ -94,13 +94,13 @@ var/global/list/string_slot_flags = list(
 	"holster" = SLOT_HOLSTER
 )
 
-/proc/get_mannequin(var/ckey)
-	if(!mannequins_)
-		mannequins_ = new()
- 	. = mannequins_[ckey]
-	if(!.)
-		. = new/mob/living/carbon/human/dummy/mannequin()
-		mannequins_[ckey] = .
+GLOBAL_LIST_EMPTY(mannequins)
+/proc/get_mannequin(var/ckey = "NULL")
+	var/mob/living/carbon/human/dummy/mannequin/M = GLOB.mannequins[ckey]
+	if(!istype(M))
+		GLOB.mannequins[ckey] = new /mob/living/carbon/human/dummy/mannequin(null)
+		M = GLOB.mannequins[ckey]
+	return M
 
 //////////////////////////
 /////Initial Building/////