Fire alarm sounds (#17992)

* STOP DROP AND ROLL BABY!

* bruh

* roasty toasty

* Choose Your Voluuume!!!!

* :U 👌 🆘

* SteelSlayer Suggestion

Co-authored-by: SteelSlayer <42044220+SteelSlayer@users.noreply.github.com>

Co-authored-by: SteelSlayer <42044220+SteelSlayer@users.noreply.github.com>

code/datums/looping_sounds/looping_sound.dm

@@ -58,9 +58,11 @@
 	muted = FALSE
 	on_start()
 
-/datum/looping_sound/proc/stop(atom/remove_thing)
+/datum/looping_sound/proc/stop(atom/remove_thing, do_not_mute)
 	if(remove_thing)
 		output_atoms -= remove_thing
+		if(do_not_mute)
+			return
 	if(muted)
 		return
 	muted = TRUE

code/datums/looping_sounds/machinery_sounds.dm

@@ -17,3 +17,19 @@
 	falloff_distance = 5
 	vary = TRUE
 	channel = CHANNEL_ENGINE
+
+GLOBAL_DATUM_INIT(firealarm_soundloop, /datum/looping_sound/firealarm, new(list(), FALSE))
+
+/datum/looping_sound/firealarm
+	mid_sounds = 'sound/machines/fire_alarm.ogg'
+	mid_length = 20
+	volume = 80
+	extra_range = 15
+	falloff_exponent = 5
+	channel = CHANNEL_FIREALARM
+
+/datum/looping_sound/firealarm/sound_loop(looped)
+	. = ..()
+	if(!length(output_atoms))
+		stop()
+