update_appearance (#55468)

Creates update_name and update_desc
Creates the wrapper proc update_appearance to batch update_name, update_desc, and update_icon together
Less non-icon handling code in update_icon and friends
Signal hooks for things that want to change names and descriptions
99%+ of the changes in this are just from switching everything over to update_appearance from update_icon

code/modules/flufftext/Hallucination.dm

@@ -135,7 +135,7 @@ GLOBAL_LIST_INIT(hallucination_list, list(
 		if(target.client)
 			target.client.images |= current_image
 
-/obj/effect/hallucination/simple/update_icon(new_state,new_icon,new_px=0,new_py=0)
+/obj/effect/hallucination/simple/update_icon(updates=ALL, new_state, new_icon, new_px=0, new_py=0)
 	image_state = new_state
 	if(new_icon)
 		image_icon = new_icon
@@ -143,6 +143,7 @@ GLOBAL_LIST_INIT(hallucination_list, list(
 		image_icon = initial(image_icon)
 	px = new_px
 	py = new_py
+	. = ..()
 	Show()
 
 /obj/effect/hallucination/simple/Moved(atom/OldLoc, Dir)
@@ -248,7 +249,7 @@ GLOBAL_LIST_INIT(hallucination_list, list(
 	name = "alien hunter ([rand(1, 1000)])"
 
 /obj/effect/hallucination/simple/xeno/throw_impact(atom/hit_atom, datum/thrownthing/throwingdatum)
-	update_icon("alienh_pounce")
+	update_icon(ALL, "alienh_pounce")
 	if(hit_atom == target && target.stat!=DEAD)
 		target.Paralyze(100)
 		target.visible_message("<span class='danger'>[target] flails around wildly.</span>","<span class='userdanger'>[name] pounces on you!</span>")