Adds the Odyssey gamemode. (#18972)

https://forums.aurorastation.org/topic/20198-mission-briefing-auroras-gamemode-revolution

To-do:

- [x] Finish storyteller verbs.
- [x] Storyteller landmarks.
- [x] Proper storyteller spawning. Right now the gamemode system is
happy with just picking one storyteller and no actors.
- [x] Antagonist whitelists code.
- [x] Adding the Storyteller whitelist.
- [x] Mission map loading code.
- [x] Map in a bunch of missions.
- [ ] Storyteller adminhelps.

---------

Co-authored-by: Matt Atlas <liermattia@gmail.com>
Co-authored-by: DreamySkrell <>

code/modules/ghostroles/spawner/base.dm

@@ -107,7 +107,7 @@
 	var/cant_see = cant_see(user)
 	if(cant_see) //If we cant see it, we cant spawn it
 		return cant_see
-	if(!(istype(user, /mob/abstract/observer) || isnewplayer(user)))
+	if(!(istype(user, /mob/abstract/ghost/observer) || isnewplayer(user)))
 		return "You are not a ghost."
 	if(!enabled) //If the spawner id disabled, we cant spawn in
 		return "This spawner is not enabled."
@@ -252,7 +252,7 @@
 		log_and_message_admins("has enabled the ghostspawner [src.name]")
 	enabled = TRUE
 	if(enable_dmessage)
-		for(var/mob/abstract/observer/O in GLOB.player_list)
+		for(var/mob/abstract/ghost/observer/O in GLOB.player_list)
 			if(O.client && !cant_see(O))
 				if(enable_dmessage == TRUE)
 					to_chat(O, "<span class='deadsay'><b>A ghostspawner for a \"[src.name]\" has been enabled.</b></span>")