Acid Runner Respawn (#4037)

# About the pull request

Acid Runner will now respawn on its turf when there's no hivecore to
respawn at. instead of not spawning at all.

# Explain why it's good for the game

If acid runner exploded without a hivecore it wouldn't respawn at all.
Now if it would respawn as a larva where it blew up, cool niche feature.

# Testing Photographs and Procedure
<details>
<summary> Acid Runner Respawn</summary>


https://github.com/cmss13-devs/cmss13/assets/43085828/97e3720d-3f6e-49f1-8258-a7e7c9c17837

</details>


# Changelog

:cl: ghostsheet
add: Acid Runners will now respawn where it blew up, if there is no
hivecore to spawn at.
/:cl:

---------

Co-authored-by: Drathek <[email protected]>

code/modules/mob/living/carbon/xenomorph/mutators/strains/runner/acid.dm

@@ -159,7 +159,12 @@
 		new /obj/effect/particle_effect/smoke/acid_runner_harmless(T)
 	playsound(bound_xeno, 'sound/effects/blobattack.ogg', 75)
 	if(bound_xeno.client && bound_xeno.hive)
-		addtimer(CALLBACK(bound_xeno.hive, TYPE_PROC_REF(/datum/hive_status, free_respawn), bound_xeno.client), 5 SECONDS)
+		var/datum/hive_status/hive_status = bound_xeno.hive
+		var/turf/spawning_turf = get_turf(bound_xeno)
+		if(!hive_status.hive_location)
+			addtimer(CALLBACK(bound_xeno.hive, TYPE_PROC_REF(/datum/hive_status, respawn_on_turf), bound_xeno.client, spawning_turf), 0.5 SECONDS)
+		else
+			addtimer(CALLBACK(bound_xeno.hive, TYPE_PROC_REF(/datum/hive_status, free_respawn), bound_xeno.client), 5 SECONDS)
 	bound_xeno.gib()
 
 /mob/living/carbon/xenomorph/runner/ventcrawl_carry()

code/modules/mob/living/carbon/xenomorph/xeno_defines.dm

@@ -936,6 +936,24 @@
 	else
 		hive_ui.update_burrowed_larva()
 
+/datum/hive_status/proc/respawn_on_turf(client/xeno_client, turf/spawning_turf)
+	var/mob/living/carbon/xenomorph/larva/new_xeno = spawn_hivenumber_larva(spawning_turf, hivenumber)
+	if(isnull(new_xeno))
+		return FALSE
+
+	if(!SSticker.mode.transfer_xeno(xeno_client.mob, new_xeno))
+		qdel(new_xeno)
+		return FALSE
+
+	new_xeno.visible_message(SPAN_XENODANGER("A larva suddenly emerges from a dead husk!"),
+	SPAN_XENOANNOUNCE("The hive has no core! You manage to emerge from your old husk as a larva!"))
+	msg_admin_niche("[key_name(new_xeno)] respawned at \a [spawning_turf]. [ADMIN_JMP(spawning_turf)]")
+	playsound(new_xeno, 'sound/effects/xeno_newlarva.ogg', 50, 1)
+	if(new_xeno.client?.prefs?.toggles_flashing & FLASH_POOLSPAWN)
+		window_flash(new_xeno.client)
+
+	hive_ui.update_burrowed_larva()
+
 /datum/hive_status/proc/do_buried_larva_spawn(mob/xeno_candidate)
 	var/spawning_area
 	if(hive_location)