Port VOREStation PR 6914 Speed up map load significantly

- Set initialized = FALSE on unsimulated turfs that need to intialize.
- Most of area/New() to initialize
- Faster lookup of self-init on atoms
- Split air alarm and fire alarm files, move new to initialize
- Tweak decals and opacity

Co-authored-by: Aronai Sieyes <arokha@arokha.com>
Co-authored-by: Leshana <Leshana@users.noreply.github.com>

code/controllers/subsystems/air.dm

@@ -38,7 +38,7 @@ SUBSYSTEM_DEF(air)
 
 	current_cycle = 0
 	var/simulated_turf_count = 0
-	for(var/turf/simulated/S in turfs)
+	for(var/turf/simulated/S in world)
 		simulated_turf_count++
 		S.update_air_properties()
 		CHECK_TICK

code/controllers/subsystems/atoms.dm

@@ -8,9 +8,9 @@ SUBSYSTEM_DEF(atoms)
 	init_order = INIT_ORDER_ATOMS
 	flags = SS_NO_FIRE
 
-	var/initialized = INITIALIZATION_INSSATOMS
+	var/static/initialized = INITIALIZATION_INSSATOMS
 	// var/list/created_atoms // This is never used, so don't bother. ~Leshana
-	var/old_initialized
+	var/static/old_initialized
 
 	var/list/late_loaders
 	var/list/created_atoms

code/controllers/subsystems/mapping.dm

@@ -16,8 +16,7 @@ SUBSYSTEM_DEF(mapping)
 
 	if(config.generate_map)
 		// Map-gen is still very specific to the map, however putting it here should ensure it loads in the correct order.
-		if(using_map.perform_map_generation())
-			using_map.refresh_mining_turfs()
+		using_map.perform_map_generation()
 
 
 /datum/controller/subsystem/mapping/proc/load_map_templates()

code/controllers/subsystems/skybox.dm

@@ -6,6 +6,38 @@ SUBSYSTEM_DEF(skybox)
 	flags = SS_NO_FIRE
 	var/list/skybox_cache = list()
 
+	var/list/dust_cache = list()
+	var/list/speedspace_cache = list()
+	var/list/phase_shift_by_x = list()
+	var/list/phase_shift_by_y = list()
+
+/datum/controller/subsystem/skybox/PreInit()
+	//Static
+	for (var/i in 0 to 25)
+		var/image/im = image('icons/turf/space_dust.dmi', "[i]")
+		im.plane = DUST_PLANE
+		im.alpha = 128 //80
+		im.blend_mode = BLEND_ADD
+		dust_cache["[i]"] = im
+	//Moving
+	for (var/i in 0 to 14)
+		// NORTH/SOUTH
+		var/image/im = image('icons/turf/space_dust_transit.dmi', "speedspace_ns_[i]")
+		im.plane = DUST_PLANE
+		im.blend_mode = BLEND_ADD
+		speedspace_cache["NS_[i]"] = im
+		// EAST/WEST
+		im = image('icons/turf/space_dust_transit.dmi', "speedspace_ew_[i]")
+		im.plane = DUST_PLANE
+		im.blend_mode = BLEND_ADD
+		speedspace_cache["EW_[i]"] = im
+
+	//Shuffle some lists
+	phase_shift_by_x = get_cross_shift_list(15)
+	phase_shift_by_y = get_cross_shift_list(15)
+
+	. = ..()
+
 /datum/controller/subsystem/skybox/Initialize()
 	. = ..()
 

code/controllers/subsystems/xenoarch.dm

@@ -30,7 +30,7 @@ SUBSYSTEM_DEF(xenoarch)
 	. = ..()
 
 /datum/controller/subsystem/xenoarch/proc/SetupXenoarch()
-	for(var/turf/simulated/mineral/M in turfs)
+	for(var/turf/simulated/mineral/M in world)
 		if(!M.density || M.z in using_map.xenoarch_exempt_levels)
 			continue