More macros (#2955)

changes:

Holomaps now use an area flag instead of a proc to determine which areas do not draw on the holomap.
The supply shuttle once more has a roof.
The supply shuttle's landing zone is now dynamically lit.
Turfs only generate visibility updates on Initialize() after mapload - visualnet is not initialized by then anyways.
Merged /datum/gas_mixture/(init) into /datum/gas_mixture/New().
Converted a ZAS proc into a macro.
Made ZAS attempt to remove a turf from a zone instead of always rebuilding it in a certain case.
Macroized two misc procs.
Fixes #2947.

code/ZAS/Connection.dm

@@ -60,8 +60,8 @@ Class Procs:
 
 /connection/New(turf/simulated/A, turf/simulated/B)
 	#ifdef ZASDBG
-	ASSERT(SSair.has_valid_zone(A))
-	//ASSERT(SSair.has_valid_zone(B))
+	ASSERT(TURF_HAS_VALID_ZONE(A))
+	//ASSERT(TURF_HAS_VALID_ZONE(B))
 	#endif
 	src.A = A
 	src.B = B

code/ZAS/Turf.dm

@@ -43,7 +43,7 @@
 		if(istype(unsim, /turf/simulated))
 
 			var/turf/simulated/sim = unsim
-			if(SSair.has_valid_zone(sim))
+			if(TURF_HAS_VALID_ZONE(sim))
 
 				SSair.connect(sim, src)
 
@@ -150,11 +150,15 @@
 			#endif
 
 			//Check that our zone hasn't been cut off recently.
-			//This happens when windows move or are constructed. We need to rebuild.
+			//This happens when windows move or are constructed. Try to remove first, otherwise we need to rebuild.
 			if((previously_open & d) && istype(unsim, /turf/simulated))
 				var/turf/simulated/sim = unsim
 				if(zone && sim.zone == zone)
-					zone.rebuild()
+					if (can_safely_remove_from_zone())
+						c_copy_air()
+						zone.remove(src)
+					else
+						zone.rebuild()
 					return
 
 			continue
@@ -166,8 +170,7 @@
 			var/turf/simulated/sim = unsim
 			sim.open_directions |= reverse_dir[d]
 
-			if(SSair.has_valid_zone(sim))
-
+			if(TURF_HAS_VALID_ZONE(sim))
 				//Might have assigned a zone, since this happens for each direction.
 				if(!zone)
 
@@ -182,11 +185,8 @@
 						#endif
 
 						//Postpone this tile rather than exit, since a connection can still be made.
-						if(!postponed) postponed = list()
-						postponed.Add(sim)
-
+						LAZYADD(postponed, sim)
 					else
-
 						sim.zone.add(src)
 
 						#ifdef ZASDBG
@@ -215,7 +215,7 @@
 			if(!postponed) postponed = list()
 			postponed.Add(unsim)
 
-	if(!SSair.has_valid_zone(src)) //Still no zone, make a new one.
+	if(!TURF_HAS_VALID_ZONE(src)) //Still no zone, make a new one.
 		var/zone/newzone = new/zone()
 		newzone.add(src)
 

code/ZAS/Zone.dm

@@ -66,7 +66,7 @@ Class Procs:
 #ifdef ZASDBG
 	ASSERT(!invalid)
 	ASSERT(istype(T))
-	ASSERT(!SSair.has_valid_zone(T))
+	ASSERT(!TURF_HAS_VALID_ZONE(T))
 #endif
 	var/datum/gas_mixture/turf_air = T.return_air()
 	add_tile_air(turf_air)