Moved delayed_start logic to tournament and amended it slightly.

Disqualification added.
Withdraw is possible during a running tournament.

Author: karel26

plugins/tournament/listener.py

@@ -111,6 +111,7 @@ async def registerDCSServer(self, server: Server, data: dict) -> None:
         tournament_id = await self.get_active_tournament(server)
         if not tournament_id:
             self.tournaments.pop(server.name, None)
+            return
 
         self.tournaments[server.name] = await self.plugin.get_tournament(tournament_id)
         match_id = await self.get_active_match(server)