Handle authentication on the cluster server

[Makosai]

• This should only work on official servers. The user should encrypt their password with a pubkey from the pub key that comes with the game. It should encrypt a very small piece of data with their pub key version number. If it matches, the client encrypt their credentials and send it to the server. Then the server checks it. These credentials can be a username and password or an OpenID token.

• TODO what to do afterwards? How to store the data, hash, refresh, what number to start ids at? 2FA when using username login? And more common sense changes.