Kill game faster on exit

[Xyene]

The game takes way too long to exit. There's an exit-game-waiting-time option in the XML, but it doesn't seem to do anything. Perhaps it would be possible to detect some winapi call sequence the client performs only on exit, and just kill all open sockets + exit(0) there. This would probably need a lot of testing to ensure the conditions for the auto-kill aren't fulfilled anytime during regular gameplay 😅