D11021: [Media contoller] Add simple volume control

[Radek Hušek]

Pitel created this revision.
Pitel added a reviewer: Plasma.
Restricted Application added a project: Plasma.
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REVISION SUMMARY
  Add simple volume control to Media Controller applet. Volume can by changed by:
  
  - mouse wheel on applet icon (3 % step), and
  - new global shortcuts (5 % step, unbound by default).
  
  There is no mute support currently (mpris interface does not have a mute method so we would have to keep
  track of old volume).
  
  Currently the patch does only prevent volume from being negative but it will try to set volume larger than 1 (mpris spec
  does not prevent players from using larger volumes).

TEST PLAN
  Tested in daily use with Cantata and SMPlayer. There is no UI change.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D11021

AFFECTED FILES
  applets/mediacontroller/contents/ui/main.qml
  dataengines/mpris2/multiplexedservice.cpp

To: Pitel, #plasma
Cc: plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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