Change hardcoded defines to use bitflags (#67722)

code/__DEFINES/plumbing.dm

@@ -1,8 +1,8 @@
-#define FIRST_DUCT_LAYER 1
-#define SECOND_DUCT_LAYER 2
-#define THIRD_DUCT_LAYER 4
-#define FOURTH_DUCT_LAYER 8
-#define FIFTH_DUCT_LAYER 16
+#define FIRST_DUCT_LAYER (1<<0)
+#define SECOND_DUCT_LAYER (1<<1)
+#define THIRD_DUCT_LAYER (1<<2)
+#define FOURTH_DUCT_LAYER (1<<3)
+#define FIFTH_DUCT_LAYER (1<<4)
 
 #define DUCT_LAYER_DEFAULT THIRD_DUCT_LAYER
 

code/__DEFINES/power.dm

@@ -1,6 +1,6 @@
-#define CABLE_LAYER_1 1
-#define CABLE_LAYER_2 2
-#define CABLE_LAYER_3 4
+#define CABLE_LAYER_1 (1<<0)
+#define CABLE_LAYER_2 (1<<1)
+#define CABLE_LAYER_3 (1<<2)
 
 #define MACHINERY_LAYER_1 1
 

code/__DEFINES/turfs.dm

@@ -1,9 +1,9 @@
-#define CHANGETURF_DEFER_CHANGE 1
-#define CHANGETURF_IGNORE_AIR 2 // This flag prevents changeturf from gathering air from nearby turfs to fill the new turf with an approximation of local air
-#define CHANGETURF_FORCEOP 4
-#define CHANGETURF_SKIP 8 // A flag for PlaceOnTop to just instance the new turf instead of calling ChangeTurf. Used for uninitialized turfs NOTHING ELSE
-#define CHANGETURF_INHERIT_AIR 16 // Inherit air from previous turf. Implies CHANGETURF_IGNORE_AIR
-#define CHANGETURF_RECALC_ADJACENT 32 //Immediately recalc adjacent atmos turfs instead of queuing.
+#define CHANGETURF_DEFER_CHANGE (1<<0)
+#define CHANGETURF_IGNORE_AIR (1<<1) // This flag prevents changeturf from gathering air from nearby turfs to fill the new turf with an approximation of local air
+#define CHANGETURF_FORCEOP (1<<2)
+#define CHANGETURF_SKIP (1<<3) // A flag for PlaceOnTop to just instance the new turf instead of calling ChangeTurf. Used for uninitialized turfs NOTHING ELSE
+#define CHANGETURF_INHERIT_AIR (1<<4) // Inherit air from previous turf. Implies CHANGETURF_IGNORE_AIR
+#define CHANGETURF_RECALC_ADJACENT (1<<5) //Immediately recalc adjacent atmos turfs instead of queuing.
 
 #define IS_OPAQUE_TURF(turf) (turf.directional_opacity == ALL_CARDINALS)