* #35 Create `ElementNavigationController` subclass
* #35 Add encryption icons
* #35 Add avatar and encryption badge image to the room screen view model
* #35 Create `RoomHeaderView` class
* #35 Replace room title with a RoomHeaderView instance in the toolbar
* #35 Add changelog
* #35 Introduce `UITestScreenIdentifier` and refactor ui tests
* #35 Fix old tests
* #35 add some tests for room screen
* #35 Use svgs instead of pngs
* #35 Fix PR remarks
- updated the authentication coordinator to use async await
- replaced the UserSession with a ClientProxy (similar to the RoomProxy)
- renamed `completion` to `callback` on the coordinators and view models
- renamed `viewModelResult` to `viewModelAction`
- introduced back UserSession as a user specific service container
