Implement surrender option (migrated from trac, id 51 )
Original report is from Tue Sep 15 10:56:30 2009 by user: Nager
Original asignee for this issue is user: somebody
A simple text command "/surrender" that switches the player state to "defeated".
Goes along nicely with a fixed #35 (closed) (git-link) where the map is revealed to the defeated player and he has reason to stay in the game to watch the ongoing action.