atmos: make fires more destructive

Fires can now burn through walls, windows, and (with a high enough
 temperature) rwalls.
New proc: adjacent_fire_act().  Called on turfs that a fire isn't able
 to spread to. (walls, floor surrounded by windows, etc.)

Signed-off-by: Mloc-Argent <colmohici@gmail.com>

code/game/objects/structures/window.dm

@@ -324,7 +324,7 @@
 
 //checks if this window is full-tile one
 /obj/structure/window/proc/is_fulltile()
-	if(dir in list(5,6,9,10))
+	if(dir & (dir - 1))
 		return 1
 	return 0