Revert "pls"

This reverts commit 8c97511871.

code/modules/mapping/space_management/multiz_helpers.dm

@@ -0,0 +1,47 @@
+/proc/get_step_multiz(ref, dir)
+	if(dir & UP)
+		dir &= ~UP
+		return get_step(SSmapping.get_turf_above(get_turf(ref)), dir)
+	if(dir & DOWN)
+		dir &= ~DOWN
+		return get_step(SSmapping.get_turf_below(get_turf(ref)), dir)
+	return get_step(ref, dir)
+
+/proc/get_dir_multiz(turf/us, turf/them)
+	us = get_turf(us)
+	them = get_turf(them)
+	if(!us || !them)
+		return NONE
+	if(us.z == them.z)
+		return get_dir(us, them)
+	else
+		var/turf/T = us.above()
+		var/dir = NONE
+		if(T && (T.z == them.z))
+			dir = UP
+		else
+			T = us.below()
+			if(T && (T.z == them.z))
+				dir = DOWN
+			else
+				return get_dir(us, them)
+		return (dir | get_dir(us, them))
+
+/turf/proc/above()
+	return get_step_multiz(src, UP)
+
+/turf/proc/below()
+	return get_step_multiz(src, DOWN)
+
+/proc/dir_inverse_multiz(dir)
+	var/holder = dir & (UP|DOWN)
+	if((holder == NONE) || (holder == (UP|DOWN)))
+		return turn(dir, 180)
+	dir &= ~(UP|DOWN)
+	dir = turn(dir, 180)
+	if(holder == UP)
+		holder = DOWN
+	else
+		holder = UP
+	dir |= holder
+	return dir