Makes some machines upgradeable (#3311)

Adds the ability to upgrade the following:
- Sleepers
- The ore processor
- All cooking appliances (Minus the microwave)
- Tesla Coil

Also makes components not spawn in machines until they are needed (When they are being upgraded) to reduce the objects generated. Adds some new macro's and converts some istypes to use them. And moves stock parts into their own file.

code/modules/mining/machine_processing.dm

@@ -160,6 +160,14 @@
 	idle_power_usage = 15
 	active_power_usage = 50
 
+	component_types = list(
+			/obj/item/weapon/circuitboard/refiner,
+			/obj/item/weapon/stock_parts/capacitor = 2,
+			/obj/item/weapon/stock_parts/scanning_module,
+			/obj/item/weapon/stock_parts/micro_laser = 2,
+			/obj/item/weapon/stock_parts/matter_bin
+		)
+
 /obj/machinery/mineral/processing_unit/Initialize()
 	. = ..()
 
@@ -298,3 +306,30 @@
 			continue
 
 	console.updateUsrDialog()
+
+/obj/machinery/mineral/processing_unit/attackby(obj/item/weapon/W as obj, mob/user as mob)
+	if(default_deconstruction_screwdriver(user, W))
+		return
+	else if(default_part_replacement(user, W))
+		return
+	
+/obj/machinery/mineral/processing_unit/RefreshParts()
+	..()
+	var/scan_rating = 0
+	var/cap_rating = 0
+	var/laser_rating = 0
+	if(!component_parts)
+		scan_rating = 1
+		cap_rating = 2
+		laser_rating = 2
+
+	for(var/obj/item/weapon/stock_parts/P in component_parts)
+		if(isscanner(P))
+			scan_rating += P.rating
+		else if(iscapacitor(P))
+			cap_rating += P.rating
+		else if(ismicrolaser(P))
+			laser_rating += P.rating
+
+	sheets_per_tick += scan_rating + cap_rating + laser_rating
+