Refactored directionals (#20082)

Refactored directionals, ported lists of directions from TG, got rid of
useless proc to get the reverse direction.

code/modules/vehicles/cargo_train.dm

@@ -242,7 +242,7 @@
 		return 0
 
 	if(is_train_head())
-		if(direction == reverse_direction(dir) && tow)
+		if(direction == REVERSE_DIR(dir) && tow)
 			//Allow the engine to rotate, but only if there's not another piece in the new direction
 			//Basically, to allow the first rotation at spawn to align with the rest of the convoy, without it being a CBT
 			if(!(locate(/obj/vehicle/train) in get_step(src, direction)))

code/modules/vehicles/train.dm

@@ -177,7 +177,7 @@
 
 		if(dir == T_dir) 	//if car is ahead
 			src.attach_to(T, user)
-		else if(reverse_direction(dir) == T_dir)	//else if car is behind
+		else if(REVERSE_DIR(dir) == T_dir)	//else if car is behind
 			T.attach_to(src, user)
 
 //returns 1 if this is the lead car of the train

code/modules/vehicles/vehicle.dm

@@ -167,7 +167,7 @@
 	pulse2.icon_state = "empdisable"
 	pulse2.name = "emp sparks"
 	pulse2.anchored = 1
-	pulse2.set_dir(pick(GLOB.cardinal))
+	pulse2.set_dir(pick(GLOB.cardinals))
 
 	QDEL_IN(pulse2, 10)
 	if(on)