[PTBF] Hallucination: The Backrooms (#27710)

* add backrooms hallucination

* mapmerge

* fix some backrooms issues and add some error handling stuff

* change backrooms carpet

* remove code that isn't doing anything

* tick new backrooms file

* try a new method with movement

* don't smooth corners

* fix red carpet hiding under backrooms carpet

* fix multiple turfs

* accidentally removed important code tracking items, oops

* implement new solution to the backrooms clone thing

* hmm so that's what the icon does

* indentation machine broke

* remove the tucked away spawn locations

* add comment for follow_movement

* revert oversight (the bar can keep its bevvies)

* put the thing back in that I wasn't supposed to remove

* Update code/modules/hallucinations/effects/backrooms.dm

Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>
Signed-off-by: Paul <90473506+pwbokie@users.noreply.github.com>

* Update code/modules/hallucinations/effects/backrooms.dm

Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>
Signed-off-by: Paul <90473506+pwbokie@users.noreply.github.com>

* fix missing comma

* code improvement tweaks from DLG

* add a fade out and in

---------

Signed-off-by: Paul <90473506+pwbokie@users.noreply.github.com>
Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>

code/game/objects/effects/landmarks.dm

@@ -118,6 +118,14 @@ INITIALIZE_IMMEDIATE(/obj/effect/landmark/newplayer_start) //Without this you sp
 	name = "bubblegum_arena_exit"
 	icon_state = "bubblegumjumpscare"
 
+/obj/effect/landmark/spawner/backrooms
+	name = "backrooms_spawn"
+	icon_state = "Assistant"
+
+/obj/effect/landmark/spawner/backrooms/Initialize(mapload)
+	spawner_list = GLOB.backroomswarp
+	return ..()
+
 /obj/effect/landmark/spawner/syndie
 	name = "Syndicate-Spawn"
 	icon_state = "Syndie"