D16962: Add mute button with dynamic icon to MPRIS volume control

[Billy Laws]

blaws marked an inline comment as done.

REPOSITORY
  R224 KDE Connect

REVISION DETAIL
  https://phabricator.kde.org/D16962

To: blaws, #kde_connect
Cc: albertvaka, nicolasfella, kdeconnect, shivanshukantprasad, skymoore, wistak, dvalencia, rmenezes, julioc, Leptopoda, timothyc, jdvr, Danial0_0, johnq, Pitel, adeen-s, SemperPeritus, daniel.z.tg, jeanv, seebauer, bugzy, MayeulC, menasshock, mikesomov, tctara, apol
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