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/mining/mine_items.dm

@@ -671,7 +671,7 @@
 
 	for(var/obj/item/device/radio/beacon/B in teleportbeacons)
 		var/turf/T = get_turf(B)
-		if(T.z in current_map.station_levels)
+		if(isStationLevel(T.z))
 			destinations += B
 
 	return destinations

code/modules/mining/minebot.dm

@@ -9,7 +9,6 @@
 	req_access = list(access_mining, access_robotics)
 	idcard_type = /obj/item/weapon/card/id/minedrone
 	speed = -1
-	range_limit = 0
 	var/health_upgrade
 	var/ranged_upgrade
 	var/melee_upgrade
@@ -154,6 +153,17 @@
 		visible_message("\icon[src] <span class = 'notice'>The [usr] pings, \"[P.name] ready for review\", and happily disgorges a small printout.</span>", range = 2)
 		playsound(src.loc, 'sound/machines/ping.ogg', 50, 0)
 
+/mob/living/silicon/robot/drone/mining/process_level_restrictions()
+	//Abort if they should not get blown
+	if (lockcharge || scrambledcodes || emagged)
+		return
+	//Check if they are not on a station level -> abort
+	var/turf/T = get_turf(src)
+	if (!T || isStationLevel(T.z))
+		return
+	to_chat(src,"WARNING: Removal from NanoTrasen property detected. Anti-Theft mode activated.")
+	gib()
+
 /**********************Minebot Upgrades**********************/
 
 /obj/item/device/mine_bot_ugprade