Makes the arrivals shuttle more robust (#2565)

It's harder to mess with the shuttle and after failing to return so many times it boots people off. It also connects the airlocks to distro and gives it a backup canister.

code/game/objects/effects/landmarks.dm

@@ -25,6 +25,10 @@
 			latejoin += loc
 			delete_me = 1
 			return
+		if("KickoffLocation")
+			kickoffsloc += loc
+			delete_me = 1
+			return
 		if("JoinLateGateway")
 			latejoin_gateway += loc
 			delete_me = 1

code/game/objects/structures/window.dm

@@ -489,6 +489,21 @@
 	smooth = SMOOTH_TRUE
 	can_be_unanchored = TRUE
 
+/obj/structure/window/shuttle/crescent
+	name = "shuttle window"
+	desc = "It looks rather strong."
+	icon = 'icons/obj/smooth/shuttle_window.dmi'
+	icon_state = "shuttle_window"
+	basestate = "window"
+	reinf = 1
+	basestate = "w"
+	dir = 5
+	smooth = SMOOTH_TRUE
+	can_be_unanchored = TRUE
+
+/obj/structure/window/shuttle/crescent/take_damage()
+	return
+
 /obj/structure/window/shuttle/update_nearby_icons()
 	queue_smooth_neighbors(src)