* Extract Audio focus management to its own modules.
* Request Audio focus when playing a voice message.
* Add missing dependency.
(and remove a duplicated one)
* Request Audio focus when playing a video/audio in the media viewer.
* Pause audio when audio focus is lost.
* Rename class
* Fix tests
* Fix detekt issue.
* Audio focus: let the system handle automatic ducking when playing media.
* Document and update API
* Remove useless space.
