* Add a setting to hide grey unread messages badges.
* Move room badge logic to be built in the view model instead of in the view.
* Move setting into DeveloperOptions.
* Extract notification content building outside of the NotificationItemProxy. First step in a bigger refactoring of the NSE
* Import the attributed string buider into the NSE, sort `sources` imports
* Extract message event string building into the RoomMessageEventStringBuilder and reuse it building content for push notifications
* Cleanup
* Add changelog
* Handle link opening on the top most levels and prepare for percolating them throughout the app
* Add support for a custom app scheme
* Add specific AppRoute parsers.
* Integrate custom scheme in the AppRouteURLParser
* Switch to `element://call` and cleanup route parsing
