This was a bit of a journey:
https://github.com/matrix-org/matrix-doc/pull/3471
But it should work now and we now use the UIAHandler everywhere.

fixes #670

Add support for listing devices that do not support encryption, add support for logging out devices.

Ticks off another box in #23!

This ports the leave room dialog to QML, everywhere. There are now no differences between the various leave dialogs.

Showing the bootstrap state and showing there are unverified devices is
still missing.

fixes build with new libolm

fixes #461

relates to #658

Using a dialog after username and password have been provided.

RIP

There are probably a few things wrong with this, but I'm going to call it good enough for an initial commit