Adds a flag that lets mobs be colored with spraycans, and adds said flag to the hygienebot (#65891)

code/__DEFINES/dcs/signals/signals_mob/signals_mob_living.dm

@@ -86,3 +86,6 @@
 ///From base of mob/living/ZImpactDamage() (mob/living, levels, turf/t)
 #define COMSIG_LIVING_Z_IMPACT "living_z_impact"
 	#define NO_Z_IMPACT_DAMAGE (1<<0)
+
+///From obj/item/toy/crayon/spraycan
+#define COMSIG_LIVING_MOB_PAINTED "living_mob_painted"

code/__DEFINES/traits.dm

@@ -357,6 +357,8 @@ Remember to update _globalvars/traits.dm if you're adding/removing/renaming trai
 #define TRAIT_ELITE_CHALLENGER "elite_challenger"
 /// For living mobs. It signals that the mob shouldn't have their data written in an external json for persistence.
 #define TRAIT_DONT_WRITE_MEMORY "dont_write_memory"
+/// This mob can be painted with the spraycan
+#define TRAIT_SPRAY_PAINTABLE "spray_paintable"
 
 #define TRAIT_NOBLEED "nobleed" //This carbon doesn't bleed
 /// This atom can ignore the "is on a turf" check for simple AI datum attacks, allowing them to attack from bags or lockers as long as any other conditions are met

code/game/objects/items/crayons.dm

@@ -749,6 +749,19 @@
 
 		return
 
+	if(ismob(target) && (HAS_TRAIT(target, TRAIT_SPRAY_PAINTABLE)))
+		if(actually_paints)
+			target.add_atom_colour(paint_color, WASHABLE_COLOUR_PRIORITY)
+			SEND_SIGNAL(target, COMSIG_LIVING_MOB_PAINTED)
+		. = use_charges(user, 2, requires_full = FALSE)
+		reagents.trans_to(target, ., volume_multiplier, transfered_by = user, methods = VAPOR)
+
+		if(pre_noise || post_noise)
+			playsound(user.loc, 'sound/effects/spray.ogg', 5, TRUE, 5)
+		user.visible_message(span_notice("[user] coats [target] with spray paint!"), span_notice("You coat [target] with spray paint."))
+		return .
+
+
 	if(isobj(target) && !(target.flags_1 & UNPAINTABLE_1))
 		if(actually_paints)
 			var/color_is_dark = is_color_dark(paint_color)

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

@@ -50,6 +50,8 @@
 	)
 	AddElement(/datum/element/connect_loc, loc_connections)
 
+	ADD_TRAIT(src, TRAIT_SPRAY_PAINTABLE, INNATE_TRAIT)
+
 /mob/living/simple_animal/bot/hygienebot/explode()
 	new /obj/effect/particle_effect/foam(loc)
 
@@ -92,6 +94,8 @@
 	if(washing)
 		do_wash(loc)
 		for(var/AM in loc)
+			if (AM == src)
+				continue
 			do_wash(AM)
 		if(isopenturf(loc) && !(bot_cover_flags & BOT_COVER_EMAGGED))
 			var/turf/open/tile = loc