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/emotes/emote_mob.dm

@@ -179,7 +179,7 @@
 /mob/living/captive_brain/emote(var/message)
 	return
 
-/mob/abstract/observer/emote(var/act, var/type, var/message)
+/mob/abstract/ghost/observer/emote(var/act, var/type, var/message)
 	if(!message)
 		return