Replace hardcoded z-level numbers with a trait system

code/modules/mapping/space_management/space_level.dm

@@ -0,0 +1,14 @@
+/datum/space_level
+	var/name = "Your config settings failed, you need to fix this for the datum space levels to work"
+	var/list/neigbours = list()
+	var/list/traits
+	var/z_value = 1 //actual z placement
+	var/linkage = SELFLOOPING
+	var/xi
+	var/yi   //imaginary placements on the grid
+
+/datum/space_level/New(new_z, new_name, new_linkage = SELFLOOPING, list/new_traits = list())
+	z_value = new_z
+	name = new_name
+	traits = new_traits
+	set_linkage(new_linkage)