Changes /turf/space/transit icons in map editor

So a mapper can actually see what the hell he's doing.

Also added south and west tiles while I was at it.

code/game/turfs/space/transit.dm

@@ -20,7 +20,10 @@
 
 	return result
 
+//------------------------
+
 /turf/space/transit/north // moving to the north
+	icon_state = "arrow-north"
 	pushdirection = SOUTH  // south because the space tile is scrolling south
 	var/static/list/phase_shift_by_x
 
@@ -33,8 +36,28 @@
 	var/transit_state = (world.maxy - src.y + x_shift)%15 + 1
 
 	icon_state = "speedspace_ns_[transit_state]"
+//------------------------
+
+/turf/space/transit/south // moving to the south
+	icon_state = "arrow-south"
+	pushdirection = SOUTH  // south because the space tile is scrolling south
+	var/static/list/phase_shift_by_x
+
+/turf/space/transit/south/New()
+	..()
+	if(!phase_shift_by_x)
+		phase_shift_by_x = get_cross_shift_list(15)
+
+	var/x_shift = phase_shift_by_x[src.x % (phase_shift_by_x.len - 1) + 1]
+	var/transit_state = (world.maxy - src.y + x_shift)%15 + 1
+
+	var/icon/I = new(icon, "speedspace_ns_[transit_state]")
+	I.Flip(SOUTH)
+	icon = I
+//------------------------
 
 /turf/space/transit/east // moving to the east
+	icon_state = "arrow-east"
 	pushdirection = WEST
 	var/static/list/phase_shift_by_y
 
@@ -47,3 +70,23 @@
 	var/transit_state = (world.maxx - src.x + y_shift)%15 + 1
 
 	icon_state = "speedspace_ew_[transit_state]"
+//------------------------
+
+/turf/space/transit/west // moving to the west
+	icon_state = "arrow-west"
+	pushdirection = WEST
+	var/static/list/phase_shift_by_y
+
+/turf/space/transit/west/New()
+	..()
+	if(!phase_shift_by_y)
+		phase_shift_by_y = get_cross_shift_list(15)
+
+	var/y_shift = phase_shift_by_y[src.y % (phase_shift_by_y.len - 1) + 1]
+	var/transit_state = (world.maxx - src.x + y_shift)%15 + 1
+
+	var/icon/I = new(icon, "speedspace_ew_[transit_state]")
+	I.Flip(WEST)
+	icon = I
+
+//------------------------