Prevents final summon rune by being cleaned by normal methods (#16224)

* Prevents final summon rune by being cleaned by normal methods

* Makes it a proc

* Moves cleanable, makes it work with space cleaner

code/game/objects/effects/decals/cleanable.dm

@@ -53,6 +53,9 @@
 /obj/effect/decal/cleanable/proc/can_bloodcrawl_in()
 	return FALSE
 
+/obj/effect/decal/cleanable/is_cleanable()
+	return TRUE
+
 /obj/effect/decal/cleanable/Initialize(mapload)
 	. = ..()
 	if(loc && isturf(loc))

code/game/objects/effects/effects.dm

@@ -25,6 +25,9 @@
 /obj/effect/acid_act()
 	return
 
+/obj/effect/proc/is_cleanable() //Called when you want to clean something, and usualy delete it after
+	return FALSE
+
 /obj/effect/mech_melee_attack(obj/mecha/M)
 	return 0