Add random critter crate, remove the unused crate subtype and tweak the animal hospital lavaland ruin to use new random crate (#17536)

* Let's stick with the closet

* Update crittercrate.dm

code/game/objects/structures/crates_lockers/closets/crittercrate.dm

@@ -1,6 +0,0 @@
-/obj/structure/closet/crate/critter
-	name = "critter crate"
-	desc = "A crate which can sustain life for a while."
-	icon_state = "critter"
-	open_door_sprite = null
-	material_drop = /obj/item/stack/sheet/wood

code/game/objects/structures/crates_lockers/crittercrate.dm

@@ -5,7 +5,7 @@
 	icon_opened = "critter_open"
 	icon_closed = "critter"
 	open_door_sprite = null
-	var/already_opened = 0
+	var/already_opened = FALSE
 	var/content_mob = null
 	var/amount = 1
 	open_sound = 'sound/machines/wooden_closet_open.ogg'
@@ -15,26 +15,44 @@
 
 /obj/structure/closet/critter/can_open()
 	if(welded)
-		return 0
-	return 1
+		return
+	return TRUE
 
 /obj/structure/closet/critter/open()
 	if(!can_open())
-		return 0
+		return
 
 	if(content_mob == null) //making sure we don't spawn anything too eldritch
-		already_opened = 1
+		already_opened = TRUE
 		return ..()
 
 	if(content_mob != null && already_opened == 0)
 		for(var/i = 1, i <= amount, i++)
 			new content_mob(loc)
-		already_opened = 1
+		already_opened = TRUE
 	. = ..()
 
 /obj/structure/closet/critter/close()
 	..()
-	return 1
+	return TRUE
+
+/obj/structure/closet/critter/random
+	name = "unmarked crate"
+	desc = "A crate designed for safe transport of animals. The contents are a mystery."
+
+/obj/structure/closet/critter/random/populate_contents()
+	content_mob = pick(/mob/living/simple_animal/pet/dog/corgi,
+	/mob/living/simple_animal/pet/dog/corgi/Lisa,
+	/mob/living/simple_animal/cow,
+	/mob/living/simple_animal/pig,
+	/mob/living/simple_animal/hostile/retaliate/goat,
+	/mob/living/simple_animal/turkey,
+	/mob/living/simple_animal/chick,
+	/mob/living/simple_animal/pet/cat,
+	/mob/living/simple_animal/pet/dog/pug,
+	/mob/living/simple_animal/pet/dog/fox,
+	/mob/living/simple_animal/deer,
+	/mob/living/simple_animal/bunny)
 
 /obj/structure/closet/critter/corgi
 	name = "corgi crate"