Provide some means of authentication

[phil]

libobby should provide some means of authentication. There should be several possibilities of authentication schemes (maybe this ticket should be splitted when they are getting implemented one-by-one):

• If a user logs in the first time since the host restarted a password specified by the user will be set on the server with which it could authenticate itself after a connection loss.
• A simple global password is need to login into a server, known to all users of it.
• The server checks a user/password combination against a user database, useful for dedicated private obby servers.
• Single documents could be get some kind of password or access control list protection, but #10 has to be implemented first.

[phil]

Should we reschedule this for libobby 0.3.0?

[phil]

This ticket is now superseded by #55, #56, #57 and #58 and thus invalid.