Accounts and auth

[FinalForEach]

• [ ] Allow passing in a display name as a command line parameter
• [ ] Allow use of itch API keys to log in, rather than only jwt provided by the official itch launcher
• [ ] Allow servers to have "offline mode" where accounts are not checked
• [ ] Use an auth server to verify the itch API keys are valid, and give a session token that servers can accept

[pietru2004]

Can I propose for servers to have self-auth mode? Something like gui that pops to enter passworld, the ability to ask player to login - to pass in password. It would be helpfull on both online mode servers and offline mode ones cause you could lock server from younger siblings or other people that might have access to your pc, but you don't want to allow to do stuff on a X server. Also it could be optional to pass in passworld 0 - disable server side passworld for users 1 - server password optional for users 2 - server password required for users