This requires manually compiling an older ffmpeg version.
Also fix inhibiting sleep in the flatpak version by allowing it access
to the relevant dbus interfaces.
Flatpaks have a problem with FolderDialog from labs: it never returns a
path. Therefore Kasts was - up to now - using FileDialog from QtQuick1.
However, this was causing problems on Android and Windows. Now we only
use QtQuick1 FileDialog for flatpak and FolderDialog everywhere else.
CCBUG: 458331
KMediaSession is an audio player library that has an API which is close
to QMediaPlayer and which allows to use --- and dynamically switch
between --- different audio backends. At this moment there is
implementation for libVLC, gstreamer and QtMultimedia. Only QtMultimedia
is a hard dependency in order to at least have one functional backend on
all platforms; all other dependencies are optional.
KMediaSession has out-of-the-box, built-in MPRIS2 support, sleep inhibit,
and basic metadata support.
BUG: 462358
Closes#35
