Add mute button with dynamic icon to MPRIS volume control
Summary:
The icon changes depending on the slider value and clicking it
will switch the volume between 0 and 100
Reviewers: KDE Connect, nicolasfella
Reviewed By: KDE Connect, nicolasfella
Subscribers: apol, broulik, albertvaka, nicolasfella, kdeconnect
Tags: KDE Connect
Differential Revision: https://phabricator.kde.org/D16962