* Add the timeline controller factory to the timeline view model.
In preparation for building a timeline to swipe through media in QuickLook.
* Refactor RoomTimelineControllerFactory.
* Refactor RoomTimelineController.
* Refactor RoomTimelineProvider.
* Revert back to UIKit for the presentation of the timeline media preview.
* Fix a presentation issue where the media is clipped until the animation finishes.
* Workaround for the preview controller replacing the info button when swiping.
* Use a self-sizing detent on the media info sheet.