Converts Shutoff valve monitoring into a MC program

- Existing consoles remain for now, only refactored to use a shared nano_module. Included by default on engineering consoles, downloadable by anyone with basic engineering access.
- Tidies up the UI a bit, prevents manual toggling of valves when they are in Auto mode (as it would immediately toggle back)

code/modules/modular_computers/computers/subtypes/preset_console.dm

@@ -15,6 +15,7 @@
 	hard_drive.store_file(new/datum/computer_file/program/atmos_control())
 	hard_drive.store_file(new/datum/computer_file/program/rcon_console())
 	hard_drive.store_file(new/datum/computer_file/program/camera_monitor())
+	hard_drive.store_file(new/datum/computer_file/program/shutoff_monitor())
 
 // Medical
 /obj/item/modular_computer/console/preset/medical/install_default_programs()

code/modules/modular_computers/file_system/programs/engineering/shutoff_monitor.dm

@@ -0,0 +1,63 @@
+/datum/computer_file/program/shutoff_monitor
+	filename = "shutoffmonitor"
+	filedesc = "Shutoff Valve Monitoring"
+	nanomodule_path = /datum/nano_module/shutoff_monitor
+	program_icon_state = "atmos_control"
+	program_key_state = "atmos_key"
+	program_menu_icon = "wrench"
+	extended_desc = "This program allows for remote monitoring and control of emergency shutoff valves."
+	required_access = access_engine
+	requires_ntnet = 1
+	network_destination = "shutoff valve control computer"
+	size = 5
+	var/has_alert = 0
+
+/datum/nano_module/shutoff_monitor
+	name = "Shutoff Valve Monitoring"
+
+/datum/nano_module/shutoff_monitor/Topic(ref, href_list)
+	if(..())
+		return 1
+
+	if(href_list["toggle_enable"])
+		var/obj/machinery/atmospherics/valve/shutoff/S = locate(href_list["toggle_enable"])
+		if(!istype(S))
+			return 0
+		S.close_on_leaks = !S.close_on_leaks
+		return 1
+
+	if(href_list["toggle_open"])
+		var/obj/machinery/atmospherics/valve/shutoff/S = locate(href_list["toggle_open"])
+		if(!istype(S))
+			return 0
+		if(S.open)
+			S.close()
+		else
+			S.open()
+		return 1
+
+/datum/nano_module/shutoff_monitor/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null, var/force_open = 1, var/datum/topic_state/state = default_state)
+	var/list/data = host.initial_data()
+	var/list/valves = list()
+
+	for(var/obj/machinery/atmospherics/valve/shutoff/S in GLOB.shutoff_valves)
+		valves.Add(list(list(
+		"name" = S.name,
+		"enabled" = S.close_on_leaks,
+		"open" = S.open,
+		"x" = S.x,
+		"y" = S.y,
+		"z" = S.z,
+		"ref" = "\ref[S]"
+		)))
+
+	data["valves"] = valves
+
+	ui = SSnanoui.try_update_ui(user, src, ui_key, ui, data, force_open)
+	if (!ui)
+		ui = new(user, src, ui_key, "shutoff_monitor.tmpl", "Shutoff Valve Monitoring", 627, 700, state = state)
+		if(host.update_layout()) // This is necessary to ensure the status bar remains updated along with rest of the UI.
+			ui.auto_update_layout = 1
+		ui.set_initial_data(data)
+		ui.open()
+		ui.set_auto_update(1)