Implemented new client - server handshake protocol

- Implemented new packet types
- Changed server & client logic to use new protocol

Tags: #story[1124] (Issue 39)

src/main/java/seng302/gameServer/GameState.java

@@ -20,6 +20,7 @@ public class GameState implements Runnable {
     private Logger logger = LoggerFactory.getLogger(MarkOrder.class);
 
     private static Integer STATE_UPDATES_PER_SECOND = 60;
+    public static Integer MAX_PLAYERS = 8;
 
     private static Long previousUpdateTime;
     public static Double windDirection;