Allow configuring ruin/empty space level count - #36191

Allows map configs to set how many ruin levels (def. 7) and how many empty levels (def. 1) that will be created. Most useful for landlocked stations, event/one-off stations with unusual composition, or testing situations such as RuntimeStation.

code/datums/map_config.dm

@@ -18,6 +18,8 @@
 	var/map_file = "BoxStation.dmm"
 
 	var/traits = null
+	var/space_ruin_levels = 7
+	var/space_empty_levels = 1
 
 	var/minetype = "lavaland"
 
@@ -106,6 +108,20 @@
 		log_world("map_config traits is not a list!")
 		return
 
+	var/temp = json["space_ruin_levels"]
+	if (isnum(temp))
+		space_ruin_levels = temp
+	else if (!isnull(temp))
+		log_world("map_config space_ruin_levels is not a number!")
+		return
+
+	temp = json["space_empty_levels"]
+	if (isnum(temp))
+		space_empty_levels = temp
+	else if (!isnull(temp))
+		log_world("map_config space_empty_levels is not a number!")
+		return
+
 	if ("minetype" in json)
 		minetype = json["minetype"]