Gets chat messages from the GUI to be send forwards to the server
If the player is playing, uses the name given, otherwise uses accountname if logged in,
or Guest
Sets this games ConnectionHandler and registers this GameController as a listener
for messages received from server for this GameControllers sessionID.
Loads dynamically a game client plugin of a type chosen from LobbyView, initializes it with
parameters received from server, sets its connection handler and starts it.