Mining Drone Stuff (#10739)

Mining drones now come equipped with an RFD-M, a tethering device, and a stack of purple flags.
    Mining drones can now bump against doors to open them.
    Mining drones now have external airlock access.
    You can now click-drag with the RFD-M to lay down track.
    The charge cost for robots using the RFD-M has been lowered to 200, down from 500.
    Mining drones no longer appear as a unique role on the round join menu.
    Mining drone lights are now much brighter, and illuminate in a circle around the drone.

code/game/objects/items/weapons/RFD.dm

@@ -441,13 +441,16 @@ RFD Mining-Class
 	icon_state = "rfd-m"
 	item_state = "rfd-m"
 
-/obj/item/rfd/mining/afterattack(atom/A, mob/user, proximity)
+/obj/item/rfd/mining/attack_self(mob/user)
+	return
+
+/obj/item/rfd/mining/afterattack(atom/A, mob/user, proximity, click_parameters, var/report_duplicate = TRUE)
 	if(!proximity)
 		return
 
 	if(isrobot(user))
 		var/mob/living/silicon/robot/R = user
-		if(R.stat || !R.cell || R.cell.charge <= 500)
+		if(R.stat || !R.cell || R.cell.charge <= 200)
 			if(last_fail <= world.time - 20) //Spam limiter.
 				last_fail = world.time
 				to_chat(user, SPAN_WARNING("You are unable to produce enough charge to use \the [src]!"))
@@ -467,7 +470,8 @@ RFD Mining-Class
 		return
 
 	if(locate(/obj/structure/track) in A)
-		to_chat(user, SPAN_WARNING("There is already a track on \the [A]!"))
+		if(report_duplicate)
+			to_chat(user, SPAN_WARNING("There is already a track on \the [A]!"))
 		return
 
 	playsound(src.loc, 'sound/machines/click.ogg', 10, 1)
@@ -480,7 +484,7 @@ RFD Mining-Class
 	if(isrobot(user))
 		var/mob/living/silicon/robot/R = user
 		if(R.cell)
-			R.cell.use(500)
+			R.cell.use(200)
 	else
 		stored_matter--
 		to_chat(user, SPAN_NOTICE("The RFD now holds <b>[stored_matter]/30</b> fabrication-units."))

code/game/objects/items/weapons/cards_ids.dm

@@ -425,7 +425,7 @@ var/const/NO_EMAG_ACT = -50
 	assignment = "Minedrone"
 
 /obj/item/card/id/minedrone/New()
-	access = list(access_maint_tunnels, access_mailsorting, access_cargo, access_cargo_bot, access_qm, access_mining, access_mining_station)
+	access = list(access_maint_tunnels, access_mailsorting, access_cargo, access_cargo_bot, access_qm, access_mining, access_mining_station, access_external_airlocks)
 	..()
 
 /obj/item/card/id/centcom

code/game/objects/items/weapons/tether.dm

@@ -35,10 +35,8 @@ var/list/global/all_tethers = list()
 
 /obj/item/tethering_device/process()
 	var/turf/our_turf = get_turf(src)
-	for(var/tether in all_tethers)
+	for(var/tether in all_tethers - src)
 		var/obj/item/tethering_device/TD = tether
-		if(TD == src)
-			continue
 		if(!TD.active)
 			continue
 		var/turf/target_turf = get_turf(TD)