* Show the now playing cover when playing an item, otherwise show the
collection cover.
* ItemModelLoaders now correctly expose list properties of non-built-in
Qt objects
* toString is now implemented for lists, fixing some query
construction code.
* PlaybackManager now clears the playlist when playing a single item to
prevent weird behaviour.
* The covers are slightly updated.
* PlaybackManager has been updated to workaround limitiations in
QtMultimedia
* PlaybackManager now sends the DeviceProfile to the server when
determining the playback url. This makes the Jellyfin server send
information back about transcoding.
* The DeviceProfile type has been changed from an QJsonObject into the
DTO generated by the OpenAPI descripton.
* A settings page has been added on SailfishOS that allows the user to
configure the PlaybackManager to their whishes.
* The DebugInfo page on SailfishOS now persists its settings (closes #8)
Besides MPRIS support, this also adds support for hasPrevious() and
hasNext() in several parts to determine whether the
player/playlist/shuffler has a previous or next item.