implemented simple BattleShipServer which accepts connections over TCP
incoming connections now get detected, implemented basic state machine in GameServer
make NetworkInterface a static class, first try to receive a command from the client
fixed test for NetworkInterface to use the static methods
fixed segmentation fault, because of uninitialized variable
fixed minor bugs in NetworkInterface
fixed sending of PlayerJoinCommand from the client
fixed handling of packages by the server
added the cBattleshipSimpleClient executable, for a simpler terminal based client