Shuttle refactor (#2171)

Rewrites the area movement code used by shuttles & elevators in an effort to make it faster, more extensible, and generally easier to read. Also fixes some bugs relating to lighting & moving areas, such as lighting overlays suddenly being teleported into space for absolutely no reason.

Fixes #2161.
Fixes #2166.

code/modules/shuttles/shuttle.dm

@@ -80,7 +80,7 @@
 //just moves the shuttle from A to B, if it can be moved
 //A note to anyone overriding move in a subtype. move() must absolutely not, under any circumstances, fail to move the shuttle.
 //If you want to conditionally cancel shuttle launches, that logic must go in short_jump() or long_jump()
-/datum/shuttle/proc/move(var/area/origin, var/area/destination, var/direction=null)
+/datum/shuttle/proc/move(var/area/origin, var/area/destination)
 
 	//world << "move_shuttle() called for [shuttle_tag] leaving [origin] en route to [destination]."
 
@@ -115,7 +115,7 @@
 	for(var/mob/living/simple_animal/pest in destination)
 		pest.gib()
 
-	origin.move_contents_to(destination, direction=direction)
+	origin.move_contents_to(destination)
 
 	for(var/mob/M in destination)
 		if(M.client)
@@ -130,20 +130,6 @@
 			if(!M.buckled)
 				M.Weaken(3)
 
-	// Power-related checks. If shuttle contains power related machinery, update powernets.
-	var/update_power = 0
-	for(var/obj/machinery/power/P in destination)
-		update_power = 1
-		break
-
-	for(var/obj/structure/cable/C in destination)
-		update_power = 1
-		break
-
-	if(update_power)
-		makepowernets()
-	return
-
 //returns 1 if the shuttle has a valid arrive time
 /datum/shuttle/proc/has_arrive_time()
 	return (moving_status == SHUTTLE_INTRANSIT)