Replace explicit z-level checks with defines

code/__HELPERS/level_traits.dm

@@ -0,0 +1,17 @@
+// Helpers for checking whether a z-level conforms to a specific requirement
+
+// Basic levels
+#define is_centcom_level(z) ((z) == ZLEVEL_CENTCOM)
+
+#define is_station_level(z) ((z) in GLOB.station_z_levels)
+
+#define is_mining_level(z) ((z) == ZLEVEL_MINING)
+
+#define is_reebe(z) ((z) == ZLEVEL_CITYOFCOGS)
+
+#define is_transit_level(z) ((z) == ZLEVEL_TRANSIT)
+
+#define is_away_level(z) ((z) > ZLEVEL_SPACEMAX)
+
+// If true, the singularity cannot strip away asteroid turf on this Z
+#define is_planet_level(z) (GLOB.z_is_planet["z"])

code/__HELPERS/roundend.dm

@@ -182,7 +182,7 @@
 							num_human_escapees++
 						if(shuttle_areas[get_area(Player)])
 							num_shuttle_escapees++
-	
+
 	.[POPCOUNT_SURVIVORS] = num_survivors
 	.[POPCOUNT_ESCAPEES] = num_escapees
 	.[POPCOUNT_SHUTTLE_ESCAPEES] = num_shuttle_escapees
@@ -194,7 +194,7 @@
 	var/list/parts = list()
 	var/station_evacuated = EMERGENCY_ESCAPED_OR_ENDGAMED
 	var/popcount = count_survivors()
-	
+
 	//Round statistics report
 	var/datum/station_state/end_state = new /datum/station_state()
 	end_state.count()
@@ -393,7 +393,7 @@
 			text += " <span class='greentext'>survived</span>"
 		if(fleecheck)
 			var/turf/T = get_turf(ply.current)
-			if(!T || !(T.z in GLOB.station_z_levels))
+			if(!T || !is_station_level(T.z))
 				text += " while <span class='redtext'>fleeing the station</span>"
 		if(ply.current.real_name != ply.name)
 			text += " as <b>[ply.current.real_name]</b>"

code/__HELPERS/unsorted.dm

@@ -1434,11 +1434,6 @@ GLOBAL_DATUM_INIT(dview_mob, /mob/dview, new)
 	temp = ((temp + (temp>>3))&29127) % 63	//070707
 	return temp
 
-//checks if a turf is in the planet z list.
-/proc/turf_z_is_planet(turf/T)
-	return GLOB.z_is_planet["[T.z]"]
-
-
 //same as do_mob except for movables and it allows both to drift and doesn't draw progressbar
 /proc/do_atom(atom/movable/user , atom/movable/target, time = 30, uninterruptible = 0,datum/callback/extra_checks = null)
 	if(!user || !target)