Adds ability to auto-follow debris for meteor events (#20917)

* general outline

* Works pretty well at this point?

* Fixes up some other smaller things

* Improve documentation

* Removes some unused code

* Removes a stray comment too

* minor reorganization

* thanks gdn

* qdel null

* Remove unused proc

* Remove some other unused functionality

* sirryan review

* merges

code/modules/events/meteors_event.dm

@@ -3,8 +3,14 @@
 	endWhen 		= 7
 	var/next_meteor = 6
 	var/waves = 1
+	var/obj/screen/alert/augury/meteor/screen_alert
 
 /datum/event/meteor_wave/setup()
+	for(var/mob/dead/observer/O in GLOB.dead_mob_list)
+		var/obj/screen/alert/augury/meteor/A = O.throw_alert("\ref[src]_augury", /obj/screen/alert/augury/meteor)
+		if(A)
+			screen_alert = A
+
 	waves = severity * rand(1,3)
 
 /datum/event/meteor_wave/announce()
@@ -16,6 +22,9 @@
 
 //meteor showers are lighter and more common,
 /datum/event/meteor_wave/tick()
+	// keep observers updated with the alert
+	for(var/mob/dead/observer/O in GLOB.dead_mob_list)
+		O.throw_alert("\ref[src]_augury", /obj/screen/alert/augury/meteor)
 	if(waves && activeFor >= next_meteor)
 		INVOKE_ASYNC(GLOBAL_PROC, GLOBAL_PROC_REF(spawn_meteors), get_meteor_count(), get_meteors())
 		next_meteor += rand(15, 30) / severity
@@ -23,6 +32,9 @@
 		endWhen = (waves ? next_meteor + 1 : activeFor + 15)
 
 /datum/event/meteor_wave/end()
+	for(var/mob/M in GLOB.dead_mob_list)
+		M.clear_alert("\ref[src]_augury")
+	QDEL_NULL(screen_alert)
 	switch(severity)
 		if(EVENT_LEVEL_MAJOR)
 			GLOB.minor_announcement.Announce("The station has cleared the meteor storm.", "Meteor Alert")