Fixed nasty synchronization bug when players leave during start of a game. Fixed netpacket error which occured occasionally during game start when only one player was left, the last player will be removed from the game now, but stay in the lobby. Added new stat to IRC bot.

src/net/common/servergamethread.cpp

@@ -404,6 +404,8 @@ void
 ServerGameThread::MoveSessionToLobby(SessionWrapper session, int reason)
 {
 	GracefulRemoveSession(session);
+	// Reset ready flag - just in case it is set, player may leave at any time.
+	session.sessionData->ResetReadyFlag();
 	GetLobbyThread().ReAddSession(session, reason);
 }