Refactored directionals (#20082)

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

code/ZAS/Fire.dm

@@ -162,7 +162,7 @@ If it gains pressure too slowly, it may leak or just rupture instead of explodin
 		A.fire_act(air_contents.temperature, air_contents.volume)
 
 	//spread
-	for(var/direction in GLOB.cardinal)
+	for(var/direction in GLOB.cardinals)
 		var/turf/simulated/enemy_tile = get_step(my_tile, direction)
 
 		if(istype(enemy_tile))
@@ -202,7 +202,7 @@ If it gains pressure too slowly, it may leak or just rupture instead of explodin
 		qdel(src)
 		return
 
-	set_dir(pick(GLOB.cardinal))
+	set_dir(pick(GLOB.cardinals))
 
 	var/datum/gas_mixture/air_contents = loc.return_air()
 	color = fire_color(air_contents.temperature)

code/ZAS/Turf.dm

@@ -93,7 +93,7 @@
 
 			var/connected_dirs
 			GET_ZONE_NEIGHBOURS(T, connected_dirs)
-			if(connected_dirs && (dir & GLOB.reverse_dir[connected_dirs]) == dir)
+			if(connected_dirs && (dir & REVERSE_DIR(connected_dirs)) == dir)
 				. &= ~dir //they are, so unflag the cardinals in question
 
 	//it is safe to remove src from the zone if all cardinals are connected by corner turfs
@@ -179,7 +179,7 @@
 		if(istype(unsim, /turf/simulated))
 
 			var/turf/simulated/sim = unsim
-			sim.open_directions |= GLOB.reverse_dir[d]
+			sim.open_directions |= REVERSE_DIR(d)
 
 			if(TURF_HAS_VALID_ZONE(sim))
 				//Might have assigned a zone, since this happens for each direction.