Allows you to zoom and pan now.

relates to #647

This makes them less annoying when scrolling or accessing the popup
menu.

See also #860

I think old clang-format is just buggy in those cases, so we should
reenable those blocks, once everyone has 13 or up.

fixes #674

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!

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

Added support for refreshing the device list, marking current device with a checkmark instead of a lock

- Fixes scrolling to an event not being reliable
- Adds new /goto command that can open URLs, go to events, or go to message indexes.
- Refactored ChatPage::handleMatrixUri() to contain the handling originally in Nheko::openLink(), and makes it return a boolean based on whether the URL was handled internally or not.