fixes coiling issue (#15530)

* why

* new signals for resting and stop pulling

these are to be used as signals that will cancel the coiling

* Create coiling.dm

* Update coiling.dm

* adds sprite accessory for coiled naga

* main changes that apply the actual visuals to the coiling mechanics

* adds message to coiling, fixes offset, adds action icon

* coil offset was using old direction

* reordering

* fixes coil sprite not disappearing

* fixes offsets, solves loadout issue

* follows lin's suggestion and adds support for slimes by making it entirely handled in handle mutant

* fix

* Update preferences.dm

* no slimes you're not allowed the hidden sprite

code/modules/client/preferences.dm

@@ -2136,6 +2136,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 							var/datum/sprite_accessory/S = instance
 							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
 								continue
+							if(S.ignore)
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_taur_list[S.name] = path
 					var/new_taur

code/modules/mob/dead/new_player/sprite_accessories/_sprite_accessories.dm

@@ -29,7 +29,7 @@
 		if(path == prototype && skip_prototype)
 			continue
 		var/datum/sprite_accessory/P = path
-		if((roundstart && initial(P.locked)) || initial(P.ignore))
+		if((roundstart && initial(P.locked)))
 			continue
 		var/datum/sprite_accessory/D = new path()
 

code/modules/mob/living/carbon/human/innate_abilities/customization.dm

@@ -135,6 +135,8 @@
 			var/datum/sprite_accessory/taur/instance = GLOB.taur_list[path]
 			if(istype(instance, /datum/sprite_accessory))
 				var/datum/sprite_accessory/S = instance
+				if(S.ignore)
+					continue
 				if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(H.client.ckey)))
 					snowflake_taur_list[S.name] = path
 		var/new_taur