Gateway map fixes (#550)

* Fixes some bugs

* Fixes the sound issue with beaches, sort of.

* Gateway touch-up

- The Gateway is no longer its own area.
- Removed turrets
- Added stuff for missions

code/game/area/Space Station 13 areas.dm

@@ -2670,7 +2670,8 @@ area/space/atmosalert()
 	lighting_use_dynamic = 0
 	requires_power = 0
 	ambience = list()
-	var/sound/mysound = null
+// Vorestation Removal - This is very broken. Sounds do not stop when you leave the area.
+/*	var/sound/mysound = null
 
 	New()
 		..()
@@ -2718,7 +2719,7 @@ area/space/atmosalert()
 					spawn(sound_delay)
 						H << S
 
-		spawn(60) .()
+		spawn(60) .()*/
 
 /////////////////////////////////////////////////////////////////////
 /*

maps/RandomZLevels/beach.dm

@@ -13,8 +13,6 @@
 
 /area/awaymission/beach
 	base_turf = /turf/simulated/floor/beach/sand
-	valid_mobs = list(/mob/living/simple_animal/crab)
-	valid_flora = list(/obj/effect/overlay/palmtree_r,/obj/effect/overlay/palmtree_l, /obj/effect/overlay/palmtree_r,/obj/effect/overlay/palmtree_l, /obj/effect/overlay/coconut)
 
 /area/awaymission/beachexit // This serves only to stop the sound spam of the beach before leaving. Maybe.
 	icon_state = "red"
@@ -33,6 +31,8 @@
 
 /area/awaymission/beach/jungle
 	icon_state = "green"
+	valid_mobs = list(/mob/living/simple_animal/crab)
+	valid_flora = list(/obj/effect/overlay/palmtree_r,/obj/effect/overlay/palmtree_l, /obj/effect/overlay/palmtree_r,/obj/effect/overlay/palmtree_l, /obj/effect/overlay/coconut)
 	mobcountmax = 10
 	floracountmax = 5000