D16667: [app] Add system volume control

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R224 KDE Connect

BRANCH
  remotesystemvolume

REVISION DETAIL
  https://phabricator.kde.org/D16667

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