Multiplayer fix - show the right remote ships
GameScreen initialization must happen first

- Game screen init has to occur before trying to re-create the network
player's ships from received data (need World sb)
- Still buggy - no crash, and no immediate game over, but opposing ship
is "ghost drawn" on joining screen - visible on minimap, but not on the
screen. Drawn correctly on hosting screen.
- Initial ship positions do not appear to match between two screens