Adds docking controllers

Squashed 10 commits:

Adds simple docking controllers

Adds docking_controllers.dm

Moves docking handshake code into its own type
Keeps docking code separate from the code for messing with airlocks and
doors.

Improves handling of invalid states

Adds docking controller to research shuttle dock

Also adds the start of a nano-ui template.

Resetting the dock controller resets the override

Adds debug verbs

Adds support for overriding docking checks

Less confusing name for the docking program

code/game/machinery/embedded_controller/airlock_docking_controller.dm

@@ -0,0 +1,137 @@
+//a docking port based on an airlock
+/obj/machinery/embedded_controller/radio/airlock/airlock_controller/docking_port
+	name = "docking port controller"
+	var/datum/computer/file/embedded_program/airlock/docking/airlock_prog
+	var/datum/computer/file/embedded_program/docking/airlock/docking_prog
+
+/obj/machinery/embedded_controller/radio/airlock/airlock_controller/docking_port/initialize()
+	airlock_prog = new/datum/computer/file/embedded_program/airlock/docking(src)
+
+	airlock_prog.tag_exterior_door = tag_exterior_door
+	airlock_prog.tag_interior_door = tag_interior_door
+	airlock_prog.tag_airpump = tag_airpump
+	airlock_prog.tag_chamber_sensor = tag_chamber_sensor
+	airlock_prog.tag_exterior_sensor = tag_exterior_sensor
+	airlock_prog.tag_interior_sensor = tag_interior_sensor
+	airlock_prog.memory["secure"] = 1
+	
+	docking_prog = new/datum/computer/file/embedded_program/docking/airlock/(src, airlock_prog)
+	program = docking_prog
+	
+	spawn(10)
+		airlock_prog.signalDoor(tag_exterior_door, "update")		//signals connected doors to update their status
+		airlock_prog.signalDoor(tag_interior_door, "update")
+
+/obj/machinery/embedded_controller/radio/airlock/airlock_controller/docking_port/ui_interact(mob/user, ui_key = "main", var/datum/nanoui/ui = null)
+	var/data[0]
+
+	data = list(
+		"chamber_pressure" = round(airlock_prog.memory["chamber_sensor_pressure"]),
+		"exterior_status" = airlock_prog.memory["exterior_status"],
+		"interior_status" = airlock_prog.memory["interior_status"],
+		"processing" = airlock_prog.memory["processing"],
+	)
+
+	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data)
+
+	if (!ui)
+		ui = new(user, src, ui_key, "simple_airlock_console.tmpl", name, 470, 290)
+
+		ui.set_initial_data(data)
+
+		ui.open()
+
+		ui.set_auto_update(1)
+
+/obj/machinery/embedded_controller/radio/airlock/airlock_controller/docking_port/Topic(href, href_list)
+	var/clean = 0
+	switch(href_list["command"])	//anti-HTML-hacking checks
+		if("cycle_ext")
+			clean = 1
+		if("cycle_int")
+			clean = 1
+		if("force_ext")
+			clean = 1
+		if("force_int")
+			clean = 1
+		if("abort")
+			clean = 1
+
+	if(clean)
+		program.receive_user_command(href_list["command"])
+
+	return 1
+
+
+
+//A docking controller for an airlock based docking port
+/datum/computer/file/embedded_program/docking/airlock
+	var/datum/computer/file/embedded_program/airlock/docking/airlock_prog
+
+/datum/computer/file/embedded_program/docking/airlock/New(var/obj/machinery/embedded_controller/M, var/datum/computer/file/embedded_program/airlock/docking/A)
+	..(M)
+	airlock_prog = A
+	airlock_prog.master_prog = src
+
+/datum/computer/file/embedded_program/docking/airlock/receive_user_command(command)
+	..(command)
+	airlock_prog.receive_user_command(command)	//pass along to subprograms
+
+/datum/computer/file/embedded_program/docking/airlock/process()
+	airlock_prog.process()
+	..()
+
+/datum/computer/file/embedded_program/docking/airlock/receive_signal(datum/signal/signal, receive_method, receive_param)
+	var/receive_tag = signal.data["tag"]		//for docking signals, this is the sender id
+	var/command = signal.data["command"]
+	var/recipient = signal.data["recipient"]	//the intended recipient of the docking signal
+	
+	if (recipient == id_tag && command == "enable_override" && receive_tag == tag_target)
+		
+	
+	..(signal, receive_method, receive_param)
+	airlock_prog.receive_signal(signal, receive_method, receive_param)	//pass along to subprograms
+
+//tell the docking port to start getting ready for docking - e.g. pressurize
+/datum/computer/file/embedded_program/docking/airlock/prepare_for_docking()
+	airlock_prog.begin_cycle_in()
+
+//are we ready for docking?
+/datum/computer/file/embedded_program/docking/airlock/ready_for_docking()
+	return airlock_prog.done_cycling()
+
+//we are docked, open the doors or whatever.
+/datum/computer/file/embedded_program/docking/airlock/finish_docking()
+	airlock_prog.open_doors()
+
+//tell the docking port to start getting ready for undocking - e.g. close those doors.
+/datum/computer/file/embedded_program/docking/airlock/prepare_for_undocking()
+	airlock_prog.stop_cycling()
+	airlock_prog.close_doors()
+
+//are we ready for undocking?
+/datum/computer/file/embedded_program/docking/airlock/ready_for_undocking()
+	return airlock_prog.check_doors_secured()
+
+/datum/computer/file/embedded_program/docking/airlock/reset()
+	airlock_prog.stop_cycling()
+	airlock_prog.close_doors()
+	..()
+
+//An airlock controller to be used by the airlock-based docking port controller.
+//Same as a regular airlock controller but allows disabling of the regular airlock functions when docking
+/datum/computer/file/embedded_program/airlock/docking
+	
+	var/datum/computer/file/embedded_program/docking/airlock/master_prog
+
+/datum/computer/file/embedded_program/airlock/docking/receive_user_command(command)
+	if (master_prog.undocked() || master_prog.override_enabled)	//only allow the port to be used as an airlock if nothing is docked here or the override is enabled
+		..(command)
+
+/datum/computer/file/embedded_program/airlock/docking/proc/open_doors()
+	toggleDoor(memory["interior_status"], tag_interior_door, memory["secure"], "open")
+	toggleDoor(memory["exterior_status"], tag_exterior_door, memory["secure"], "open")
+
+/datum/computer/file/embedded_program/airlock/docking/cycleDoors(var/target)
+	if (master_prog.undocked() || master_prog.override_enabled)	//only allow the port to be used as an airlock if nothing is docked here or the override is enabled
+		..(target)