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/admin/view_variables/topic.dm

@@ -170,7 +170,7 @@
 			return
 
 		var/del_action = alert("Are you really sure you want to delete all objects of type [O.type]?",,"Yes","No", "Hard Delete")
-		if(del_action == "No")
+		if (del_action == "No" || !del_action)
 			return
 
 		if(alert("Second confirmation required. Delete?",,"Yes","No") != "Yes")