Moved game state maintenance for client into AtlantisClient.

Removed the GameStatus() object. For the client, status updates move
into AtlantisClient.
Establishing new server->client update model. Interim checkin.

Save this before continuing further. I may add an inner class to
AtlantisEntity to communicate entity changes across the network.
Worker moves under split entity plan.
Merge branch 'issue11' into develop