* Make the UserPreference macro also generate an accessor for the key name.
* Initial implementation of AccountSettings.
- Add an AccountUserDefaults storage with a userID prefix on the key.
- Migrate the 2 values reset by AppSettings.resetSessionSpecificSettings to AccountSettings.
* Rename UserSettings.volatile() to UserSettings.mock()
Given it now has a userID parameter with a default value..
Opening a room on an event always built a detached timeline, even when the
live timeline already contained that event, e.g. when tapping the notification
for the newest message in a room.
The timeline controller now stays on the live timeline in that case, scrolling
to and highlighting the event, and only builds a detached timeline when the
event isn't loaded.