First commit of manual port of BS12

#13042
and
#13086

code/_helpers/global_lists.dm

@@ -33,6 +33,8 @@ var/global/list/language_keys[0]					// Table of say codes for all languages
 var/global/list/whitelisted_species = list("Human") // Species that require a whitelist check.
 var/global/list/playable_species = list("Human")    // A list of ALL playable species, whitelisted, latejoin or otherwise.
 
+var/list/mannequins_
+
 // Posters
 var/global/list/poster_designs = list()
 
@@ -137,6 +139,14 @@ 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] = .
+
 //////////////////////////
 /////Initial Building/////
 //////////////////////////