Implement ClientCommunication about chessgame

[DrOverbuild]

This class, being the implementation of AbstractClient, will implement handleMessageFromServer() and it has the method to send objects to the server. The class diagram connects each data class to their respective GUI controllers, so I've decided that in order to keep true to the diagram, we will have this class delegate task to the controller classes. For example, when the handleMessageFromServer() receives an object of the WaitingRoomData class, call the method receiveWaitingRoomData() on WaitingRoomController.

Example:

private ChessClient client; // linked to main class in constructor

public void handleMessageFromServer(Object o) {
    ...
    if (o instanceof WaitingRoomData) {
        client.getWaitingRoomControl().receiveWaitingRoomData();
    } 

    ...

    if (o instanceof NextTurnData) {
        client.getGameControl().receiveNextTurnData();
    }

    ...
}

This means that the currently open controller will handle the incoming data after this class figures out what that data is. Therefore, each view controller will need to have a receive method for every data class it will receive.