Changes to drones and z-macros (#7068)

Turns the z-level restriction procs into macros
Changes z-level restrictions to use the macros
Use contact_levels for announcements (instead of player_levels)
Restricts the teleporter to station_levels instead of player_levels
Restricts AI tracking to station_levels instead of player_levels
Mechs only get tracking beacons if they are on station_levels (instead of player_levels)
Construction Drones gib if they enter a station level
Mining Drones gib if they leave the station levels
Removes the mining equipment vendor from the scrapheap

code/modules/power/lights/fixtures.dm

@@ -108,7 +108,7 @@
 	if (start_with_cell && !no_emergency)
 		cell = new /obj/item/weapon/cell/device/emergency_light(src)
 
-	if (mapload && loc && !(z in current_map.admin_levels))
+	if (mapload && loc && isNotAdminLevel(z))
 		switch(fitting)
 			if("tube")
 				if(prob(2))

code/modules/power/smes.dm

@@ -436,7 +436,7 @@
 	failure_timer = max(failure_timer, duration)
 
 /obj/machinery/power/smes/proc/ion_act()
-	if(src.z in current_map.station_levels)
+	if(isStationLevel(src.z))
 		if(prob(1)) //explosion
 			for(var/mob/M in viewers(src))
 				M.show_message("<span class='warning'>The [src.name] is making strange noises!</span>", 3, "<span class='warning'>You hear sizzling electronics.</span>", 2)