Remove a whole bunch of in world loops and rework machinery global lists (#3053)

Removes a whole bunch of in world loops.
Reworks SSmachinery to hold two lists: all_machines and processing_machines. all_machines contains all machines 5ever. All of them. Literally. Forever. And ever. processing_machines only contains machines that process with the SSmachinery controller.

I checked most types at runtime on the live server to see whether they're in processing_machines or in all_machines, and did debug to ensure that most machinery ends up and stays in all_machines.

Includes a basic UT to make sure all mapped in machinery types remain within the all_machines list post-init.

code/modules/overmap/ships/engines/engine.dm

@@ -9,7 +9,7 @@ var/list/ship_engines = list()
 /datum/ship_engine/New(var/obj/machinery/holder)
 	engine = holder
 	zlevel = holder.z
-	for(var/obj/machinery/computer/engines/E in machines)
+	for(var/obj/machinery/computer/engines/E in SSmachinery.processing_machines)
 		if (E.z == zlevel && !(src in E.engines))
 			E.engines += src
 			break
@@ -53,8 +53,8 @@ var/list/ship_engines = list()
 	return 1
 
 /datum/ship_engine/proc/die()
-	for(var/obj/machinery/computer/engines/E in machines)
+	for(var/obj/machinery/computer/engines/E in SSmachinery.processing_machines)
 		if (E.z == zlevel)
 			E.engines -= src
 			break
-	qdel(src)
+	qdel(src)

code/modules/overmap/ships/ship.dm

@@ -16,11 +16,11 @@
 
 /obj/effect/map/ship/Initialize()
 	. = ..()
-	for(var/obj/machinery/computer/engines/E in machines)
+	for(var/obj/machinery/computer/engines/E in SSmachinery.processing_machines)
 		if (E.z == map_z)
 			eng_control = E
 			break
-	for(var/obj/machinery/computer/helm/H in machines)
+	for(var/obj/machinery/computer/helm/H in SSmachinery.processing_machines)
 		if (H.z == map_z)
 			nav_control = H
 			break
@@ -112,5 +112,5 @@
 		var/turf/newloc = locate(x + deltas[1], y + deltas[2], z)
 		if(newloc)
 			Move(newloc)
-		if(rotate)	
+		if(rotate)
 			rotate(get_heading())