Machinery type now has integrated Item type that handles most processing.

- This somewhat reduces copy-paste of code between item and machinery types. Machinery type still needs some code, but it's been reduced to absolute minimum.

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

@@ -0,0 +1,75 @@
+// Held by /obj/machinery/modular_computer to reduce amount of copy-pasted code.
+/obj/item/modular_computer/processor
+	name = "processing unit"
+	desc = "You shouldn't see this. If you do, report it."
+	icon = null
+	icon_state = null
+	icon_state_unpowered = null
+	icon_state_menu = null
+	hardware_flag = 0
+
+	var/obj/machinery/modular_computer/machinery_computer = null
+
+// Process is handled via machinery half of this, due to power interaction.
+/obj/item/modular_computer/processor/process()
+	return PROCESS_KILL
+
+/obj/item/modular_computer/processor/New(var/comp)
+	if(!comp || !istype(comp, /obj/machinery/modular_computer))
+		CRASH("Inapropriate type passed to obj/item/modular_computer/processor/New()! Aborting.")
+		return
+	// Obtain reference to machinery computer
+	machinery_computer = comp
+	machinery_computer.cpu = src
+	// Now steal the computer's components and assume them as our own. The computer will send us commands, we'll do most of the work.
+	hard_drive = machinery_computer.hard_drive
+	machinery_computer.hard_drive = null
+	if(hard_drive)
+		hard_drive.holder2 = src
+		hard_drive.holder = null
+	network_card = machinery_computer.network_card
+	machinery_computer.network_card = null
+	if(network_card)
+		network_card.holder2 = src
+		network_card.holder = null
+	nano_printer = machinery_computer.nano_printer
+	machinery_computer.nano_printer = null
+	if(nano_printer)
+		nano_printer.holder = src
+		nano_printer.holder = null
+	card_slot = machinery_computer.card_slot
+	machinery_computer.card_slot = null
+	if(card_slot)
+		card_slot.holder2 = src
+		card_slot.holder = null
+	battery = machinery_computer.battery
+	machinery_computer.battery = null
+	hardware_flag = machinery_computer.hardware_flag
+
+/obj/item/modular_computer/processor/find_hardware_by_name(var/N)
+	var/datum/computer_hardware/H = machinery_computer.find_hardware_by_name(N)
+	if(H)
+		return H
+	else
+		return ..()
+
+/obj/item/modular_computer/processor/get_header_data()
+	var/list/L = ..()
+	if(machinery_computer.tesla_link && machinery_computer.tesla_link.enabled)
+		L["PC_apclinkicon"] = "charging.gif"
+	return L
+
+// Checks whether the machinery computer doesn't take power from APC network
+/obj/item/modular_computer/processor/check_power_override()
+	if(!machinery_computer)
+		return 0
+	if(!machinery_computer.tesla_link || !machinery_computer.tesla_link.enabled)
+		return 0
+	return 1
+
+//
+/obj/item/modular_computer/processor/CanUseTopic(user, state)
+	if(!machinery_computer)
+		return 0
+	return machinery_computer.CanUseTopic(user, state)
+