Implements usage of the REVERSE_DIR macro throughout the code. (#77122)

## About The Pull Request
Replaces a ton of `turn(dir, 180)` calls with the aforementioned macro.

## Why It's Good For The Game
Afaik, `REVERSE_DIR` was coded to be faster than the classic `turn(dir,
180)` call, being a simple set of binary operations. To sum it up, micro
optimization.

## Changelog

N/A

code/modules/shuttle/docking.dm

@@ -46,7 +46,7 @@
 		rotation = SIMPLIFY_DEGREES(rotation)
 
 	if(!movement_direction)
-		movement_direction = turn(preferred_direction, 180)
+		movement_direction = REVERSE_DIR(preferred_direction)
 
 	var/list/moved_atoms = list() //Everything not a turf that gets moved in the shuttle
 	var/list/areas_to_move = list() //unique assoc list of areas on turfs being moved