Fixes issues with closing apps on tablets (#75117)

## About The Pull Request

- Fixes background apps not reloading the UI
- Standardizes opening/closing/backgrounding apps
- Simplifies the way apps are closed instead of having 2 procs, one on
the PC and one on the program, being named the same thing (wtf)
- Removes program states. They existed so computers can know to update
their UI every process tick, but since we now do this event based, this
is no longer needed, which is good.
- Replaces the 'forced' arg from kill_program as it was completely
unused, with ``reload_ui``, which is now used to open the UI on close,
and not to when we don't want it to.
- Closing background apps no longer reloads the entire UI
- Responding to an NT Message will no longer open the UI on your face.

## Why It's Good For The Game

Closes https://github.com/tgstation/tgstation/issues/75046
Closes https://github.com/tgstation/tgstation/issues/75108

Makes tablet UIs more responsive and lag less, not checking if a program
is closed every process to close it, and makes responding to messages
not a hassle every time.
Also makes the code easier to understand/read,

## Changelog

🆑
fix: Tablets' minimize apps feature works again.
/🆑

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

@@ -30,7 +30,7 @@
 	examine_text += span_info("Alt-click to eject the intelliCard.")
 	return examine_text
 
-/datum/computer_file/program/ai_restorer/kill_program(forced)
+/datum/computer_file/program/ai_restorer/kill_program()
 	try_eject(forced = TRUE)
 	return ..()
 

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

@@ -51,6 +51,6 @@
 	. = ..(user)
 	GLOB.alarmdisplay += src
 
-/datum/computer_file/program/alarm_monitor/kill_program(forced = FALSE)
+/datum/computer_file/program/alarm_monitor/kill_program()
 	GLOB.alarmdisplay -= src
 	return ..()

code/modules/modular_computers/file_system/programs/antagonist/dos.dm

@@ -32,13 +32,12 @@
 			target = null
 			error = "Connection to destination relay lost."
 
-/datum/computer_file/program/ntnet_dos/kill_program(forced = FALSE)
+/datum/computer_file/program/ntnet_dos/kill_program()
 	if(target)
 		target.dos_sources.Remove(src)
 	target = null
 	executed = FALSE
-
-	..()
+	return ..()
 
 /datum/computer_file/program/ntnet_dos/ui_act(action, params, datum/tgui/ui, datum/ui_state/state)
 	switch(action)

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

@@ -19,7 +19,7 @@
 	DL_source = null
 	return ..()
 
-/datum/computer_file/program/borg_monitor/kill_program(forced = FALSE)
+/datum/computer_file/program/borg_monitor/kill_program()
 	loglist = null //Not everything is saved if you close an app
 	DL_source = null
 	DL_progress = 0

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

@@ -79,7 +79,7 @@
 		return FALSE
 	computer.crew_manifest_update = TRUE
 
-/datum/computer_file/program/card_mod/kill_program(forced)
+/datum/computer_file/program/card_mod/kill_program()
 	computer.crew_manifest_update = FALSE
 	var/obj/item/card/id/inserted_auth_card = computer.computer_id_slot
 	if(inserted_auth_card)

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

@@ -162,6 +162,6 @@
 		return TRUE
 	return FALSE
 
-/datum/computer_file/program/ntnetdownload/kill_program(forced)
+/datum/computer_file/program/ntnetdownload/kill_program()
 	abort_file_download()
 	return ..()

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

@@ -3,7 +3,6 @@
 	filedesc = "Direct Messenger"
 	category = PROGRAM_CATEGORY_MISC
 	program_icon_state = "command"
-	program_state = PROGRAM_STATE_BACKGROUND
 	extended_desc = "This program allows old-school communication with other modular devices."
 	size = 0
 	undeletable = TRUE // It comes by default in tablets, can't be downloaded, takes no space and should obviously not be able to be deleted.
@@ -414,7 +413,7 @@
 		if(!computer.turn_on(usr, open_ui = FALSE))
 			return
 	if(computer.active_program != src)
-		if(!computer.open_program(usr, src))
+		if(!computer.open_program(usr, src, open_ui = FALSE))
 			return
 	if(!href_list["close"] && usr.can_perform_action(computer, FORBID_TELEKINESIS_REACH))
 		switch(href_list["choice"])

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

@@ -176,7 +176,7 @@
 /datum/computer_file/program/chatclient/process_tick(seconds_per_tick)
 	. = ..()
 	var/datum/ntnet_conversation/channel = SSmodular_computers.get_chat_channel_by_id(active_channel)
-	if(program_state != PROGRAM_STATE_KILLED)
+	if(src in computer.idle_threads)
 		ui_header = "ntnrc_idle.gif"
 		if(channel)
 			// Remember the last message. If there is no message in the channel remember null.
@@ -198,7 +198,7 @@
 			channel.offline_clients.Remove(src)
 			channel.active_clients.Add(src)
 
-/datum/computer_file/program/chatclient/kill_program(forced = FALSE)
+/datum/computer_file/program/chatclient/kill_program()
 	for(var/datum/ntnet_conversation/channel as anything in SSmodular_computers.chat_channels)
 		channel.go_offline(src)
 	active_channel = null
@@ -236,7 +236,8 @@
 				authed = TRUE
 			clients.Add(list(list(
 				"name" = channel_client.username,
-				"status" = channel_client.program_state,
+				"online" = (channel_client == channel_client.computer.active_program),
+				"away" = (channel_client in channel_client.computer.idle_threads),
 				"muted" = (channel_client in channel.muted_clients),
 				"operator" = (channel.channel_operator == channel_client),
 				"ref" = REF(channel_client),

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

@@ -29,7 +29,7 @@
 		return
 	return FALSE
 
-/datum/computer_file/program/radar/kill_program(forced = FALSE)
+/datum/computer_file/program/radar/kill_program()
 	objects = list()
 	selected = null
 	STOP_PROCESSING(SSfastprocess, src)
@@ -313,7 +313,7 @@
 
 	RegisterSignal(SSdcs, COMSIG_GLOB_NUKE_DEVICE_ARMED, PROC_REF(on_nuke_armed))
 
-/datum/computer_file/program/radar/fission360/kill_program(forced)
+/datum/computer_file/program/radar/fission360/kill_program()
 	UnregisterSignal(SSdcs, COMSIG_GLOB_NUKE_DEVICE_ARMED)
 	return ..()
 

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

@@ -19,7 +19,7 @@
 	. = ..()
 	set_frequency(signal_frequency)
 
-/datum/computer_file/program/signal_commander/kill_program(forced)
+/datum/computer_file/program/signal_commander/kill_program()
 	. = ..()
 	SSradio.remove_object(computer, signal_frequency)
 

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

@@ -22,7 +22,7 @@
 	refresh()
 
 /// Apparently destroy calls this [/datum/computer_file/Destroy]. Here just to clean our references.
-/datum/computer_file/program/supermatter_monitor/kill_program(forced = FALSE)
+/datum/computer_file/program/supermatter_monitor/kill_program()
 	for(var/supermatter in supermatters)
 		clear_supermatter(supermatter)
 	return ..()