Support stations with multiple z-levels (#35339)

* Remove ZLEVEL_STATION_PRIMARY

* Add Up and Down traits for use by ladders and chasms

* Give map_config creation its own proc

* Combine LoadConfig and ValidateJSON and remove transition_config

* Make space linkage a z-level trait

* Remove ZLEVEL_EMPTY_SPACE

* Update uses of GetFullMapPath

* Handle multi-Z stations and load Lavaland and Reebe at runtime

* Remove unused space maps

* Fix inappropriate z-expansion in map reader, improve logging

* Update comments relating to z-level configuration

* Add Lavaland and Reebe to ALL_MAPS

code/game/objects/structures/ladders.dm

@@ -35,19 +35,20 @@
 /obj/structure/ladder/LateInitialize()
 	// By default, discover ladders above and below us vertically
 	var/turf/T = get_turf(src)
+	var/obj/structure/ladder/L
 
 	if (!down)
-		for (var/obj/structure/ladder/L in locate(T.x, T.y, T.z - 1))
+		L = locate() in SSmapping.get_turf_below(T)
+		if (L)
 			down = L
 			L.up = src  // Don't waste effort looping the other way
 			L.update_icon()
-			break
 	if (!up)
-		for (var/obj/structure/ladder/L in locate(T.x, T.y, T.z + 1))
+		L = locate() in SSmapping.get_turf_above(T)
+		if (L)
 			up = L
 			L.down = src  // Don't waste effort looping the other way
 			L.update_icon()
-			break
 
 	update_icon()
 

code/game/turfs/simulated/chasm.dm

@@ -11,7 +11,7 @@
 
 /turf/open/chasm/Initialize()
 	. = ..()
-	AddComponent(/datum/component/chasm, null)
+	AddComponent(/datum/component/chasm, SSmapping.get_turf_below(src))
 
 /turf/open/chasm/proc/set_target(turf/target)
 	GET_COMPONENT(chasm_component, /datum/component/chasm)
@@ -64,16 +64,6 @@
 /turf/open/chasm/CanPass(atom/movable/mover, turf/target)
 	return 1
 
-
-// Naive "down" which just subtracts a z-level
-/turf/open/chasm/straight_down
-	baseturfs = /turf/open/chasm/straight_down
-
-/turf/open/chasm/straight_down/Initialize()
-	. = ..()
-	set_target(locate(x, y, z - 1))
-
-
 // Chasms for Lavaland, with planetary atmos and lava glow
 /turf/open/chasm/lavaland
 	initial_gas_mix = LAVALAND_DEFAULT_ATMOS
@@ -95,10 +85,3 @@
 	underlay_appearance.icon = 'icons/turf/floors.dmi'
 	underlay_appearance.icon_state = "dirt"
 	return TRUE
-
-/turf/open/chasm/jungle/straight_down
-	baseturfs = /turf/open/chasm/jungle/straight_down
-
-/turf/open/chasm/jungle/straight_down/Initialize(mapload)
-	. = ..()
-	set_target(locate(x, y, z - 1))

code/game/turfs/simulated/floor/plating/dirt.dm

@@ -3,7 +3,7 @@
 	desc = "Upon closer examination, it's still dirt."
 	icon = 'icons/turf/floors.dmi'
 	icon_state = "dirt"
-	baseturfs = /turf/open/chasm/jungle/straight_down
+	baseturfs = /turf/open/chasm/jungle
 	initial_gas_mix = LAVALAND_DEFAULT_ATMOS
 	planetary_atmos = TRUE
 	attachment_holes = FALSE

code/game/turfs/space/transit.dm

@@ -40,12 +40,10 @@
 	var/min = 1+TRANSITIONEDGE
 
 	var/list/possible_transtitons = list()
-	var/k = 1
-	var/list/config_list = SSmapping.config.transition_config
-	for(var/a in config_list)
-		if(config_list[a] == CROSSLINKED) // Only pick z-levels connected to station space
-			possible_transtitons += k
-		k++
+	for(var/A in SSmapping.z_list)
+		var/datum/space_level/D = A
+		if (D.linkage == CROSSLINKED)
+			possible_transtitons += D.z_value
 	var/_z = pick(possible_transtitons)
 
 	//now select coordinates for a border turf