Replaces xeno_spawn with the generic_maintenance_landmark, adds atmos…

… safety checks to remaining midrounds that need them (tgstation#74374)

## About The Pull Request

The xeno_spawn landmark, used to pick spawn locations for many different
midrounds (but NOT xenomorphs, ironically), has been killed and been
replaced with the generic_maintenance_landmark landmark.

This also adds atmos safety checks to some of the midround spawn
location selections that were missing them:

- Paradox Clone
- Nightmare
- Fugitives
- Morph

I decided to do both of these at the same time, since I'd be touching
most of the same files anyways.

This includes an updatepaths that, if you are on a downstream running a
custom map, should probably definitely run.
## Why It's Good For The Game

It may not be a secret that these landmarks aren't used for spawning
xenomorphs anymore, but the name is still deceptive. This should
communicate what they're used for a bit better to both coders and
mappers.

Atmos safety checks (for the midrounds I hadn't yet added them to) make
sure people can play the game.

Closes tgstation#74372.
## Changelog
:cl:
code: The xeno_spawn landmark is now the generic_maintenance_landmark
landmark.
fix: Certain midrounds will now check for atmos safety before spawning.
/:cl:

_maps/map_files/Deltastation/DeltaStation2.dmm

@@ -4408,7 +4408,7 @@
 "bcJ" = (
 /obj/effect/decal/cleanable/dirt,
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/blobstart,
 /obj/effect/landmark/event_spawn,
 /obj/effect/turf_decal/tile/yellow/fourcorners,
@@ -4763,7 +4763,7 @@
 	},
 /obj/effect/landmark/event_spawn,
 /obj/effect/landmark/blobstart,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /turf/open/floor/iron,
 /area/station/maintenance/department/eva/abandoned)
 "bgL" = (
@@ -5409,7 +5409,7 @@
 /turf/open/floor/plating,
 /area/station/maintenance/department/chapel)
 "bnN" = (
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/structure/chair/wood{
 	dir = 4
 	},
@@ -5956,7 +5956,7 @@
 /area/station/engineering/atmos/storage/gas)
 "buj" = (
 /obj/effect/landmark/blobstart,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/event_spawn,
 /obj/machinery/hydroponics/soil,
 /obj/effect/decal/cleanable/dirt,
@@ -8530,7 +8530,7 @@
 	dir = 4
 	},
 /obj/effect/decal/cleanable/blood/old,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/event_spawn,
 /turf/open/floor/wood,
 /area/station/maintenance/starboard/aft)
@@ -9633,7 +9633,7 @@
 /obj/effect/turf_decal/stripes/line{
 	dir = 5
 	},
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/event_spawn,
 /turf/open/floor/iron,
 /area/station/maintenance/starboard/aft)
@@ -13409,7 +13409,7 @@
 /turf/open/floor/iron,
 /area/station/hallway/primary/central/fore)
 "dkH" = (
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/structure/cable,
 /obj/effect/turf_decal/stripes/line{
 	dir = 4
@@ -17098,7 +17098,7 @@
 /area/station/medical/medbay/lobby)
 "eix" = (
 /obj/effect/landmark/event_spawn,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/mapping_helpers/broken_floor,
 /turf/open/floor/wood,
 /area/station/security/detectives_office/private_investigators_office)
@@ -17569,7 +17569,7 @@
 /area/station/science/breakroom)
 "epp" = (
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/machinery/atmospherics/components/unary/vent_pump/on/layer4{
 	dir = 4
 	},
@@ -18757,7 +18757,7 @@
 /area/station/hallway/secondary/exit/departure_lounge)
 "eEA" = (
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/turf_decal/stripes/line{
 	dir = 1
 	},
@@ -21312,7 +21312,7 @@
 /area/station/medical/pharmacy)
 "fjX" = (
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/event_spawn,
 /turf/open/floor/plating,
 /area/station/maintenance/department/medical/morgue)
@@ -25573,7 +25573,7 @@
 /area/station/maintenance/port)
 "gnZ" = (
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/blobstart,
 /obj/effect/landmark/event_spawn,
 /obj/effect/turf_decal/tile/neutral/opposingcorners,
@@ -32213,7 +32213,7 @@
 	},
 /obj/effect/decal/cleanable/dirt,
 /obj/effect/landmark/blobstart,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/event_spawn,
 /obj/effect/turf_decal/tile/neutral/fourcorners,
 /turf/open/floor/iron/dark,
@@ -34264,7 +34264,7 @@
 /area/station/hallway/secondary/entry)
 "iyX" = (
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/turf_decal/stripes/line{
 	dir = 5
 	},
@@ -35163,7 +35163,7 @@
 "iKM" = (
 /obj/effect/decal/cleanable/dirt,
 /obj/machinery/atmospherics/pipe/smart/manifold4w/supply/hidden/layer4,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/mapping_helpers/broken_floor,
 /obj/effect/turf_decal/tile/neutral/fourcorners,
 /turf/open/floor/iron/dark,
@@ -38107,7 +38107,7 @@
 /turf/open/floor/iron/dark,
 /area/station/service/theater)
 "jwg" = (
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /turf/open/floor/plating/airless,
 /area/space/nearstation)
 "jwr" = (
@@ -42059,7 +42059,7 @@
 "kss" = (
 /obj/effect/decal/cleanable/dirt,
 /obj/effect/landmark/event_spawn,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/blobstart,
 /obj/machinery/duct,
 /turf/open/floor/plating,
@@ -44942,7 +44942,7 @@
 	dir = 8
 	},
 /obj/effect/landmark/blobstart,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/event_spawn,
 /obj/effect/decal/cleanable/dirt,
 /obj/structure/table/wood,
@@ -47244,7 +47244,7 @@
 /obj/effect/turf_decal/stripes/line{
 	dir = 4
 	},
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/event_spawn,
 /obj/effect/landmark/blobstart,
 /turf/open/floor/plating,
@@ -48134,7 +48134,7 @@
 "lTE" = (
 /obj/effect/decal/cleanable/dirt,
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/machinery/atmospherics/pipe/smart/manifold4w/scrubbers/hidden/layer2,
 /turf/open/floor/plating,
 /area/station/service/abandoned_gambling_den)
@@ -48778,7 +48778,7 @@
 /area/station/security/checkpoint/customs/fore)
 "mec" = (
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/machinery/atmospherics/pipe/smart/manifold4w/scrubbers/hidden/layer2,
 /obj/machinery/atmospherics/pipe/smart/manifold4w/supply/hidden/layer4,
 /mob/living/basic/cockroach,
@@ -49849,7 +49849,7 @@
 	dir = 4
 	},
 /obj/effect/decal/cleanable/dirt,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/blobstart,
 /obj/effect/landmark/event_spawn,
 /obj/structure/chair/stool/directional/west,
@@ -54148,7 +54148,7 @@
 /turf/open/floor/iron,
 /area/station/hallway/primary/central/fore)
 "nxh" = (
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/machinery/atmospherics/components/unary/vent_pump/on/layer4{
 	dir = 1
 	},
@@ -57683,7 +57683,7 @@
 /obj/machinery/atmospherics/components/unary/vent_pump/on/layer4{
 	dir = 4
 	},
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/blobstart,
 /obj/effect/landmark/event_spawn,
 /obj/effect/turf_decal/tile/neutral/fourcorners,
@@ -62637,7 +62637,7 @@
 /turf/open/floor/iron/dark,
 /area/station/ai_monitored/turret_protected/aisat_interior)
 "pGT" = (
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/turf_decal/tile/neutral/fourcorners,
 /turf/open/floor/iron/dark,
 /area/station/service/abandoned_gambling_den)
@@ -71068,7 +71068,7 @@
 /area/station/maintenance/department/science)
 "rMz" = (
 /obj/structure/lattice/catwalk,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /turf/open/space,
 /area/station/solars/starboard/fore)
 "rMN" = (
@@ -72433,7 +72433,7 @@
 "scd" = (
 /obj/effect/decal/cleanable/dirt,
 /obj/effect/landmark/blobstart,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/machinery/newscaster/directional/east,
 /turf/open/floor/plating,
 /area/station/service/library/abandoned)
@@ -79449,7 +79449,7 @@
 /area/station/hallway/secondary/command)
 "tPk" = (
 /obj/structure/lattice/catwalk,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /turf/open/space,
 /area/station/solars/port/aft)
 "tPo" = (
@@ -80325,7 +80325,7 @@
 	},
 /obj/effect/turf_decal/bot_red,
 /obj/effect/landmark/event_spawn,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/turf_decal/tile/yellow/opposingcorners{
 	dir = 1
 	},
@@ -81985,7 +81985,7 @@
 "uwj" = (
 /obj/machinery/atmospherics/pipe/smart/manifold4w/supply/hidden/layer4,
 /obj/effect/landmark/event_spawn,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /turf/open/floor/iron/dark,
 /area/station/service/electronic_marketing_den)
 "uwn" = (
@@ -82845,7 +82845,7 @@
 /turf/open/floor/iron,
 /area/station/engineering/atmos/project)
 "uGP" = (
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/turf_decal/stripes/line,
 /obj/machinery/atmospherics/components/unary/vent_pump/on/layer4{
 	dir = 4
@@ -85176,7 +85176,7 @@
 "vkM" = (
 /obj/effect/spawner/random/structure/chair_flipped,
 /obj/effect/landmark/event_spawn,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/turf_decal/tile/neutral/fourcorners,
 /turf/open/floor/iron,
 /area/station/maintenance/port/aft)
@@ -87985,7 +87985,7 @@
 /obj/machinery/atmospherics/components/unary/vent_pump/on/layer4{
 	dir = 1
 	},
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/turf_decal/tile/purple/half/contrasted,
 /turf/open/floor/iron,
 /area/station/maintenance/port)
@@ -89118,7 +89118,7 @@
 /obj/effect/decal/cleanable/dirt,
 /obj/machinery/atmospherics/components/unary/vent_pump/on/layer4,
 /obj/effect/landmark/event_spawn,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /turf/open/floor/plating,
 /area/station/maintenance/department/science/xenobiology)
 "wjt" = (
@@ -92356,7 +92356,7 @@
 	dir = 4
 	},
 /obj/machinery/atmospherics/pipe/smart/manifold4w/supply/hidden/layer4,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /turf/open/floor/iron,
 /area/station/science/research/abandoned)
 "wYZ" = (
@@ -94629,7 +94629,7 @@
 	dir = 4
 	},
 /obj/effect/landmark/blobstart,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /obj/effect/landmark/event_spawn,
 /turf/open/floor/plating,
 /area/station/hallway/secondary/construction)
@@ -95820,7 +95820,7 @@
 	dir = 1
 	},
 /obj/effect/landmark/event_spawn,
-/obj/effect/landmark/xeno_spawn,
+/obj/effect/landmark/generic_maintenance_landmark,
 /turf/open/floor/plating,
 /area/station/maintenance/department/science)
 "xQM" = (