Implemented a basic test of server/client communication.

-Multiple users can now enter the game and interact through a central server by means of card selection. If one user selects a card and pushes his change to the server, any user that receives an update from the server will have a card (in the same position) in his hand selected.
-Updated the LaunchScreen to include a textbox for a server IP Address.
-Added several methods and buttons to the GameWindow for testing purposes, not necessarily as features to keep in the application.