Southern Cross POI adjustment and Map adjustments

- DJ Station APC turned off at default
- DJ Station one general intercom replaced with a syndicate intercom
- DJ Station headset no longer guaranteed to spawn, one in four chance to spawn in one of the rooms
- DJ Station Exterior tiles (around the generator) marked as outdoor tiles
- Advanced roller beds moved to SAR lockers
- Blood cabinet and IV stand in SAR room, two o- blood bags and two empty blood bags at round start
- Mining outpost now locked to IDs with maintenance access and research access
- Observation windows in xenobio are now electrified
- Extra sinks and a high capacity water tank added to xenobio
- Red flags in the caves to designate the 'border' between the regular caves and the more dangerous ones
- Xenoresearch first aid station door name fixed

code/game/objects/items/devices/radio/headset.dm

@@ -180,6 +180,13 @@
 	item_state = "headset"
 	ks2type = /obj/item/device/encryptionkey/heads/captain
 
+/obj/item/device/radio/headset/heads/captain/sfr
+	name = "SFR headset"
+	desc = "A headset belonging to a Sif Free Radio DJ. SFR, best tunes in the wilderness."
+	icon_state = "com_headset_alt"
+	item_state = "headset"
+	ks2type = /obj/item/device/encryptionkey/heads/captain
+
 /obj/item/device/radio/headset/heads/ai_integrated //No need to care about icons, it should be hidden inside the AI anyway.
 	name = "\improper AI subspace transceiver"
 	desc = "Integrated AI radio transceiver."

code/game/objects/random/random.dm

@@ -897,6 +897,18 @@ something, make sure it's not in one of the other lists.*/
 				prob(1);/obj/item/weapon/beartrap,
 				prob(2);/obj/item/weapon/handcuffs,)
 
+/obj/random/sfr
+	name = "random SFR headset"
+	desc = "This is a headset spawn."
+	icon = 'icons/misc/mark.dmi'
+	icon_state = "rup"
+
+/obj/random/sfr/item_to_spawn()
+	return pick(prob(25);/obj/item/device/radio/headset/heads/captain/sfr,
+				prob(25);/obj/item/device/radio/headset/headset_cargo/alt,
+				prob(25);/obj/item/device/radio/headset/headset_com/alt,
+				prob(25);/obj/item/device/radio/headset)
+
 /obj/random/rigsuit
 	name = "Random rigsuit"
 	desc = "This is a random rigsuit."
@@ -1003,6 +1015,11 @@ var/list/multi_point_spawns
 	id = "Captain's spare id"
 	item_path = /obj/item/weapon/card/id/gold/captain/spare
 
+/obj/random_multi/single_item/sfr_headset
+	name = "Multi Point - headset"
+	id = "SFR headset"
+	item_path = /obj/random/sfr
+
 //Multiple Object Spawn
 
 /obj/random/multiple