Fix SM (and some other) follow links (#20554)

* hoopefully fix SM message tracking being really weird

* update some more follow targets

* Apply suggestions from code review

hehe

Co-authored-by: Contrabang <91113370+Contrabang@users.noreply.github.com>

* Cleans up some loose ends, implements for arrivals announcer too

* Changes target to the new deactivated core

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Co-authored-by: Contrabang <91113370+Contrabang@users.noreply.github.com>

code/game/objects/items/collar.dm

@@ -67,6 +67,7 @@
 
 	var/area/pet_death_area = get_area(M)
 	var/obj/item/radio/headset/pet_death_announcer = new /obj/item/radio/headset(src)
+	pet_death_announcer.follow_target = src
 	if(istype(pet_death_area, /area/syndicate_mothership) || istype(pet_death_area, /area/shuttle/syndicate_elite))
 		//give the syndicats a bit of stealth
 		pet_death_announcer.autosay("[M] has been vandalized in Space!", "[M]'s Death Alarm")

code/game/objects/items/devices/radio/radio_objects.dm

@@ -253,7 +253,7 @@ GLOBAL_LIST_INIT(default_medbay_channels, list(
 /obj/item/radio/proc/ToggleReception()
 	listening = !listening && !(wires.is_cut(WIRE_RADIO_RECEIVER) || wires.is_cut(WIRE_RADIO_SIGNAL))
 
-/obj/item/radio/proc/autosay(message, from, channel, role = "Unknown") //BS12 EDIT
+/obj/item/radio/proc/autosay(message, from, channel, role = "Unknown", follow_target_override) //BS12 EDIT
 	var/datum/radio_frequency/connection = null
 	if(channel && channels && channels.len > 0)
 		if(channel == "department")
@@ -295,7 +295,10 @@ GLOBAL_LIST_INIT(default_medbay_channels, list(
 	else
 		tcm.source_level = level_name_to_num(MAIN_STATION) // Assume station level if we dont have an actual Z level available to us.
 	tcm.freq = connection.frequency
-	tcm.follow_target = follow_target
+	if(follow_target_override)
+		tcm.follow_target = follow_target_override
+	else
+		tcm.follow_target = follow_target
 
 	// Now put that through the stuff
 	for(var/obj/machinery/tcomms/core/C in GLOB.tcomms_machines)