Add a separate setting to cleanbots for graffiti (#42028)

It's not nice to have your cleanbots murdered in the line of duty by
disgruntled street artists, think of the cleanbots

code/modules/mob/living/simple_animal/bot/cleanbot.dm

@@ -21,6 +21,7 @@
 	var/blood = 1
 	var/trash = 0
 	var/pests = 0
+	var/drawn = 0
 
 	var/list/target_types
 	var/obj/effect/decal/cleanable/target
@@ -177,7 +178,6 @@
 		/obj/effect/decal/cleanable/oil,
 		/obj/effect/decal/cleanable/vomit,
 		/obj/effect/decal/cleanable/robot_debris,
-		/obj/effect/decal/cleanable/crayon,
 		/obj/effect/decal/cleanable/molten_object,
 		/obj/effect/decal/cleanable/food/tomato_smudge,
 		/obj/effect/decal/cleanable/food/egg_smudge,
@@ -199,6 +199,9 @@
 		target_types += /mob/living/simple_animal/cockroach
 		target_types += /mob/living/simple_animal/mouse
 
+	if(drawn)
+		target_types += /obj/effect/decal/cleanable/crayon
+
 	if(trash)
 		target_types += /obj/item/trash
 
@@ -289,6 +292,7 @@ Maintenance panel panel is [open ? "opened" : "closed"]"})
 	if(!locked || issilicon(user)|| IsAdminGhost(user))
 		dat += "<BR>Clean Blood: <A href='?src=[REF(src)];operation=blood'>[blood ? "Yes" : "No"]</A>"
 		dat += "<BR>Clean Trash: <A href='?src=[REF(src)];operation=trash'>[trash ? "Yes" : "No"]</A>"
+		dat += "<BR>Clean Graffiti: <A href='?src=[REF(src)];operation=drawn'>[drawn ? "Yes" : "No"]</A>"
 		dat += "<BR>Exterminate Pests: <A href='?src=[REF(src)];operation=pests'>[pests ? "Yes" : "No"]</A>"
 		dat += "<BR><BR>Patrol Station: <A href='?src=[REF(src)];operation=patrol'>[auto_patrol ? "Yes" : "No"]</A>"
 	return dat
@@ -304,5 +308,7 @@ Maintenance panel panel is [open ? "opened" : "closed"]"})
 				pests = !pests
 			if("trash")
 				trash = !trash
+			if("drawn")
+				drawn = !drawn
 		get_targets()
 		update_controls()