Porting "Adjacent Atmos subsystem revival"

code/__DEFINES/atmospherics.dm

@@ -251,6 +251,13 @@
 		out_var += cached_gases[total_moles_id];\
 	}
 
+#ifdef TESTING
+GLOBAL_LIST_INIT(atmos_adjacent_savings, list(0,0))
+#define CALCULATE_ADJACENT_TURFS(T) if (SSadjacent_air.queue[T]) { GLOB.atmos_adjacent_savings[1] += 1 } else { GLOB.atmos_adjacent_savings[2] += 1; SSadjacent_air.queue[T] = 1 }
+#else
+#define CALCULATE_ADJACENT_TURFS(T) SSadjacent_air.queue[T] = 1
+#endif
+
 //Unomos - So for whatever reason, garbage collection actually drastically decreases the cost of atmos later in the round. Turning this into a define yields massively improved performance.
 #define GAS_GARBAGE_COLLECT(GASGASGAS)\
 	var/list/CACHE_GAS = GASGASGAS;\

code/__DEFINES/subsystems.dm

@@ -26,10 +26,6 @@
 
 #define TIMER_ID_NULL -1
 
-//For servers that can't do with any additional lag, set this to none in flightpacks.dm in subsystem/processing.
-#define FLIGHTSUIT_PROCESSING_NONE 0
-#define FLIGHTSUIT_PROCESSING_FULL 1
-
 #define INITIALIZATION_INSSATOMS 0	//New should not call Initialize
 #define INITIALIZATION_INNEW_MAPLOAD 2	//New should call Initialize(TRUE)
 #define INITIALIZATION_INNEW_REGULAR 1	//New should call Initialize(FALSE)
@@ -112,10 +108,10 @@
 #define FIRE_PRIORITY_AIR_TURFS		40
 #define FIRE_PRIORITY_DEFAULT		50
 #define FIRE_PRIORITY_PARALLAX		65
-#define FIRE_PRIORITY_FLIGHTPACKS	80
 #define FIRE_PRIORITY_MOBS			100
 #define FIRE_PRIORITY_TGUI			110
 #define FIRE_PRIORITY_TICKER		200
+#define FIRE_PRIORITY_ATMOS_ADJACENCY	300
 #define FIRE_PRIORITY_CHAT			400
 #define FIRE_PRIORITY_OVERLAYS		500
 #define FIRE_PRIORITY_INPUT			1000 // This must always always be the max highest priority. Player input must never be lost.

code/__DEFINES/turf_flags.dm

@@ -3,3 +3,4 @@
 #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.