Launcher should probably support some kind of "offline" mode

[VasilisThePikachu]

Let's say the auth server is down for whatever reason.

The launcher should be able to let you enter in an "offline" mode. Using your last used username.

This is mostly meant to allow you to load replays or maybe even play on the one-in-a-million offline-mode server.

This could potentially be useful for pr's like #144 so that you can set proxy settings and attempt to connect again

[walksanatora]

I agree. My parents don't let ne have internet after 10pm but I would love to try and get better on a sandbox server I localhost. But currently the launcher provides no way to connect to my Lan offline server