Machinery Component Initialization Refactor (#3258)

Machinery objects' component_parts list is now automatically populated with the types in the component_types list. Types can have an associated number which is interpreted as an instruction to spawn that number of that type. This eliminates a few Initialize() procs, and simplifies others.
Example:

component_types = list(
    /obj/foo/bar,
    /obj/baz = 2
)
Other changes:

Cable coils will now no longer force a stack size of 30 when created without their stack size passed as a parameter - this fixes anonymous types not working correctly with cable coils.

code/modules/mining/drilling/drill.dm

@@ -40,20 +40,18 @@
 
 	var/datum/effect_system/sparks/spark_system
 
+	component_types = list(
+		/obj/item/weapon/circuitboard/miningdrill,
+		/obj/item/weapon/stock_parts/matter_bin,
+		/obj/item/weapon/stock_parts/capacitor,
+		/obj/item/weapon/stock_parts/micro_laser,
+		/obj/item/weapon/cell/high
+	)
+
 /obj/machinery/mining/drill/Initialize()
 	. = ..()
-
-	component_parts = list()
-	component_parts += new /obj/item/weapon/circuitboard/miningdrill(src)
-	component_parts += new /obj/item/weapon/stock_parts/matter_bin(src)
-	component_parts += new /obj/item/weapon/stock_parts/capacitor(src)
-	component_parts += new /obj/item/weapon/stock_parts/micro_laser(src)
-	component_parts += new /obj/item/weapon/cell/high(src)
-
 	spark_system = bind_spark(src, 3)
 
-	RefreshParts()
-
 /obj/machinery/mining/drill/Destroy()
 	QDEL_NULL(spark_system)
 	return ..()
@@ -339,11 +337,9 @@
 	icon_state = "mining_brace"
 	var/obj/machinery/mining/drill/connected
 
-/obj/machinery/mining/brace/Initialize()
-	. = ..()
-
-	component_parts = list()
-	component_parts += new /obj/item/weapon/circuitboard/miningdrillbrace(src)
+	component_types = list(
+		/obj/item/weapon/circuitboard/miningdrillbrace
+	)
 
 /obj/machinery/mining/brace/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if(connected && connected.active)