machinery_process() & auto_use_power efficiency tweaks (#2657)

changes:

Machinery now uses machinery_process() instead of process(), allowing machines to be put into SSprocessing-style lists in addition to the machinery list.
Automatic power calculations now involve less proc-calls.

code/modules/mining/drilling/drill.dm

@@ -59,7 +59,7 @@
 	QDEL_NULL(spark_system)
 	return ..()
 
-/obj/machinery/mining/drill/process()
+/obj/machinery/mining/drill/machinery_process()
 
 	if(need_player_check)
 		return

code/modules/mining/machine_processing.dm

@@ -184,7 +184,7 @@
 		src.output = locate(/obj/machinery/mineral/output, get_step(src, dir))
 		if(src.output) break
 
-/obj/machinery/mineral/processing_unit/process()
+/obj/machinery/mineral/processing_unit/machinery_process()
 	..()
 
 	if (!src.output || !src.input) return

code/modules/mining/machine_stacking.dm

@@ -104,7 +104,7 @@
 		src.output = locate(/obj/machinery/mineral/output, get_step(src, dir))
 		if(src.output) break
 
-/obj/machinery/mineral/stacking_machine/process()
+/obj/machinery/mineral/stacking_machine/machinery_process()
 	..()
 	if(!console)
 		log_debug("Stacking machine tried to process, but no console has linked itself to it.")

code/modules/mining/machine_unloading.dm

@@ -23,7 +23,7 @@
 		src.output = locate(/obj/machinery/mineral/output, get_step(src, dir))
 		if(src.output) break
 
-/obj/machinery/mineral/unloading_machine/process()
+/obj/machinery/mineral/unloading_machine/machinery_process()
 	..()
 	if (src.output && src.input)
 		if (locate(/obj/structure/ore_box, input.loc))

code/modules/mining/mint.dm

@@ -30,7 +30,7 @@
 		if(src.output) break
 	processing_objects.Add(src)
 
-/obj/machinery/mineral/mint/process()
+/obj/machinery/mineral/mint/machinery_process()
 	if ( src.input)
 		var/obj/item/stack/O
 		O = locate(/obj/item/stack, input.loc)