Fix save game loading issues

[hubastard]

This PR fixes #242 and #243, which are the issues that we had where reconnecting players was sometimes joining as new players or on another planet.

We had 2 main issues:

1. We were not loading the server save file when we were hosting a game from the Load Game Window which was causing all the players to join with no player data. (This was not occurring if the host stayed in game while the clients reconnected)
2. The other issue with the players that were spawning on another planet was caused by the fact that we were not handling the save game loading of AutoSaves properly. So we were always reloading the last autosave instead of the actually loading the game that the host had chosen in the Load Game Window.

This PR also fixes the AutoSave rotation that was not handled previously and I also removed the Host button from the Esc menu.

[hubastard]

I will close it right now to make sure that this fix is available as soon as possible. But if you comments you can add them and I will fix them in a subsequent PR.