Makes the station Z level into a list instead of a single define

code/modules/mob/dead/observer/observer.dm

@@ -106,7 +106,7 @@ GLOBAL_VAR_INIT(observer_default_invisibility, INVISIBILITY_OBSERVER)
 		if(turfs.len)
 			T = pick(turfs)
 		else
-			T = locate(round(world.maxx/2), round(world.maxy/2), ZLEVEL_STATION)	//middle of the station
+			T = locate(round(world.maxx/2), round(world.maxy/2), ZLEVEL_STATION_PRIMARY)	//middle of the station
 
 	loc = T
 

code/modules/mob/living/carbon/human/life.dm

@@ -422,7 +422,7 @@ All effects don't start immediately, but rather get worse over time; the rate is
 		if(drunkenness >= 91)
 			adjustBrainLoss(0.4)
 			if(prob(20) && !stat)
-				if(SSshuttle.emergency.mode == SHUTTLE_DOCKED && z == ZLEVEL_STATION) //QoL mainly
+				if(SSshuttle.emergency.mode == SHUTTLE_DOCKED && (z in GLOB.station_z_levels)) //QoL mainly
 					to_chat(src, "<span class='warning'>You're so tired... but you can't miss that shuttle...</span>")
 				else
 					to_chat(src, "<span class='warning'>Just a quick nap...</span>")

code/modules/mob/living/simple_animal/hostile/megafauna/blood_drunk_miner.dm

@@ -114,7 +114,7 @@ Difficulty: Medium
 		if(L.stat == DEAD)
 			visible_message("<span class='danger'>[src] butchers [L]!</span>",
 			"<span class='userdanger'>You butcher [L], restoring your health!</span>")
-			if(z != ZLEVEL_STATION && !client) //NPC monsters won't heal while on station
+			if(!(z in GLOB.station_z_levels && !client)) //NPC monsters won't heal while on station
 				if(guidance)
 					adjustHealth(-L.maxHealth)
 				else

code/modules/mob/living/simple_animal/hostile/megafauna/megafauna.dm

@@ -101,7 +101,7 @@
 	visible_message(
 		"<span class='danger'>[src] devours [L]!</span>",
 		"<span class='userdanger'>You feast on [L], restoring your health!</span>")
-	if(z != ZLEVEL_STATION && !client) //NPC monsters won't heal while on station
+	if(!(z in GLOB.station_z_levels && !client)) //NPC monsters won't heal while on station
 		adjustBruteLoss(-L.maxHealth/2)
 	L.gib()