added animation of a shell to the game

- in BattleShipServer class added serialization of the AnimationMessage classs
- added to VoidVisitor and Visitor the Shell class
- edited the ServerGameLogic class to implement a new Animation state (see new Server-State-Chart)
- added a new client state AnimationState (see new Client-State-Chart)

Projekte/battleship/client/client.properties

@@ -29,7 +29,7 @@ robot.targets=2, 0,\
               2, 3
 #
 # Delay in milliseconds between each shot fired by the RobotClient.
-robot.delay=500
+robot.delay=2000
 #
 # The dimensions of the game map used in single mode.
 # 'map.width' defines the number of columns, and 'map.height' defines the number of rows.