Add support for multi client.
Remove ClientUI.java.
Add methods to handle SERVER and CLIENT side commands.
Add methods to check for winner.
Add methods to check for 5 connected point in a row.
Add method to send coordinates to server.

Change-Id: I0000000000000000000000000000000000000006
Signed-off-by: Silencieux Le <silencieux.le@gmail.com>