Fixes a bunch of harddels that are sourced from player action (#59371)

Sourced from #59118 and a cursed project I'll pr later, This pr contains a lot of harddel fixes for stuff that pops up after a player interacts with something. I'm not gonna list them all here because there's something like 60 130, check the commit log if you're curious

Oh and I moved ref tracking screaming to a separate define, and made some optimizations to the thing in general. I think that's it, this pr is a bit of a frankenstine

code/modules/modular_computers/file_system/programs/ntnrc_client.dm

@@ -19,10 +19,18 @@
 	var/list/channel_history = list()
 	var/operator_mode = FALSE // Channel operator mode
 	var/netadmin_mode = FALSE // Administrator mode (invisible to other users + bypasses passwords)
+	//A list of all the converstations we're a part of
+	var/list/datum/ntnet_conversation/conversations = list()
 
 /datum/computer_file/program/chatclient/New()
 	username = "DefaultUser[rand(100, 999)]"
 
+/datum/computer_file/program/chatclient/Destroy()
+	for(var/datum/ntnet_conversation/discussion as anything in conversations)
+		discussion.purge_client(src)
+	conversations.Cut()
+	return ..()
+
 /datum/computer_file/program/chatclient/ui_act(action, params)
 	. = ..()
 	if(.)

code/modules/modular_computers/file_system/programs/sm_monitor.dm

@@ -37,11 +37,15 @@
 	refresh()
 
 /datum/computer_file/program/supermatter_monitor/kill_program(forced = FALSE)
+	for(var/supermatter in supermatters)
+		clear_supermatter(supermatter)
 	supermatters = null
 	..()
 
 // Refreshes list of active supermatter crystals
 /datum/computer_file/program/supermatter_monitor/proc/refresh()
+	for(var/supermatter in supermatters)
+		clear_supermatter(supermatter)
 	supermatters = list()
 	var/turf/T = get_turf(ui_host())
 	if(!T)
@@ -51,9 +55,7 @@
 		if (!isturf(S.loc) || !(is_station_level(S.z) || is_mining_level(S.z) || S.z == T.z))
 			continue
 		supermatters.Add(S)
-
-	if(!(active in supermatters))
-		active = null
+		RegisterSignal(S, COMSIG_PARENT_QDELETING, .proc/react_to_del)
 
 /datum/computer_file/program/supermatter_monitor/proc/get_status()
 	. = SUPERMATTER_INACTIVE
@@ -167,3 +169,13 @@
 					active = S
 					set_signals()
 			return TRUE
+
+/datum/computer_file/program/supermatter_monitor/proc/react_to_del(datum/source)
+	SIGNAL_HANDLER
+	clear_supermatter(source)
+
+/datum/computer_file/program/supermatter_monitor/proc/clear_supermatter(matter)
+	supermatters -= matter
+	if(matter == active)
+		active = null
+	UnregisterSignal(matter, COMSIG_PARENT_QDELETING)