Connected phase

When in CONNECTED state, a game client still isn't operable. There is another mandatory transition it has to do, namely to the WAITING state. This happens once the core client tells it where to connect to with a GAME_SERVER message, and that connections could be established without problems. Alternatively, depending on the operating system, the core client will establish the connection to the game server and pass it to the game client with a GAME_SERVER_FD message, so it can be used from the start on.