Removes more NTNet from Tablets and removes a ton of dead code (#74085)

## About The Pull Request

Removes NtNet softwaredownload/communication because they did nothing,
so this also removes the feature to shut them off from Wirecarp

I removed tablets from being added to networks, Tablets already generate
logs for actions they do, which is already enough for the effects it has
in-game (just being visible to Wirecarp), once NtNet is deleted from
everything else then we can move it to ModPCs and limit logging to only
ModPC actions.

Fixes shutting off ntnet relays from Wirecarp, now you can properly shut
off Ntnet, and the warning that it kicks you out of the program is now
true.

Gives the Holodeck it's own network root define and fixes Syndicate
network showing up on Wirecarp

Wirecarp's PDA logs now shows the source of an action

## Why It's Good For The Game

Moves ModPCs further from NTNet so we can move towards deleting it
entirely
Makes Wirecarp more responsible and trustworthy
Removes useless stuff that never gets used, simplifying a overthought
overcomplicated system.

## Changelog

🆑
balance: Wirecarp now properly shuts off NtNet remotely.
balance: Wirecarp now shows the source of a PDA that does an action.
fix: Wirecarp can no longer be used to see if Nukies exist through their
networks.
del: Removes Software downloading and communication Ntnet networks, as
they were pretty worthless.
/🆑

code/modules/modular_computers/computers/item/computer.dm

@@ -135,7 +135,6 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 
 	update_appearance()
 	register_context()
-	init_network_id(NETWORK_TABLETS)
 	Add_Messenger()
 	install_default_programs()
 
@@ -468,7 +467,7 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 		shutdown_computer()
 		return
 
-	if(active_program && active_program.requires_ntnet && !get_ntnet_status(active_program.requires_ntnet_feature))
+	if(active_program && active_program.requires_ntnet && !get_ntnet_status())
 		active_program.event_networkfailure(FALSE) // Active program requires NTNet to run but we've just lost connection. Crash.
 
 	for(var/datum/computer_file/program/idle_programs as anything in idle_threads)
@@ -476,7 +475,7 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 			idle_threads.Remove(idle_programs)
 			continue
 		idle_programs.process_tick(delta_time)
-		idle_programs.ntnet_status = get_ntnet_status(idle_programs.requires_ntnet_feature)
+		idle_programs.ntnet_status = get_ntnet_status()
 		if(idle_programs.requires_ntnet && !idle_programs.ntnet_status)
 			idle_programs.event_networkfailure(TRUE)
 
@@ -607,7 +606,7 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 		to_chat(user, span_danger("\The [src] displays a \"Maximal CPU load reached. Unable to run another program.\" error."))
 		return FALSE
 
-	if(program.requires_ntnet && !get_ntnet_status(program.requires_ntnet_feature)) // The program requires NTNet connection, but we are not connected to NTNet.
+	if(program.requires_ntnet && !get_ntnet_status()) // The program requires NTNet connection, but we are not connected to NTNet.
 		to_chat(user, span_danger("\The [src]'s screen shows \"Unable to connect to NTNet. Please retry. If problem persists contact your system administrator.\" warning."))
 		return FALSE
 
@@ -621,9 +620,9 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 	return TRUE
 
 // Returns 0 for No Signal, 1 for Low Signal and 2 for Good Signal. 3 is for wired connection (always-on)
-/obj/item/modular_computer/proc/get_ntnet_status(specific_action = 0)
+/obj/item/modular_computer/proc/get_ntnet_status()
 	// NTNet is down and we are not connected via wired connection. No signal.
-	if(!SSmodular_computers.check_function(specific_action))
+	if(!SSmodular_computers.check_relay_operation())
 		return NTNET_NO_SIGNAL
 
 	// computers are connected through ethernet
@@ -647,7 +646,7 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 	if(!get_ntnet_status())
 		return FALSE
 
-	return SSnetworks.add_log(text, network_id)
+	return SSnetworks.add_log("[src]: [text]", network_id)
 
 /obj/item/modular_computer/proc/shutdown_computer(loud = 1)
 	kill_program(forced = TRUE)

code/modules/modular_computers/computers/item/pda.dm

@@ -322,7 +322,7 @@
 		return ..()
 	return FALSE
 
-/obj/item/modular_computer/pda/silicon/get_ntnet_status(specific_action = 0)
+/obj/item/modular_computer/pda/silicon/get_ntnet_status()
 	//No borg found
 	if(!silicon_owner)
 		return FALSE