Feature/setup wizard

t/register-and-settings.t is failing, but I'm creating the pull request anyway, so you can review my evil plan @marcusramberg.

So the idea is that your're in "wizard" mode when registering for the first time, instead of going directly to the dreadful settings page.

Yes, we also need to fix the settings page, but I want to do this in steps.

Please try it out and give me feedback.