Multiverse Revival (now with huds!) (#19778)

* Multiverse Revival

* Slightly less awful code

* Makes code cleaner, fixes stun issue on spawn

* Replaces usr with user in the multiverse sword +
allows it to dismember

* Prevents gang related messages displaying for multiverse clones

code/modules/admin/verbs/onlyone.dm

@@ -92,6 +92,12 @@ var/highlander = FALSE
 		H << "<B>You are the multiverse summoner. Activate your blade to summon copies of yourself from another universe to fight by your side.</B>"
 		H.mind.announce_objectives()
 
+		var/datum/gang/multiverse/G = new(src, "[H.real_name]")
+		ticker.mode.gangs += G
+		G.bosses += H.mind
+		G.add_gang_hud(H.mind)
+		H.mind.gang_datum = G
+
 		var/obj/item/slot_item_ID = H.get_item_by_slot(slot_wear_id)
 		qdel(slot_item_ID)
 		var/obj/item/slot_item_hand = H.get_item_for_held_index(2)