D15164: Support button icons when present

[Marco Martin]

mart created this revision.
mart added a reviewer: Plasma.
Herald added a project: Frameworks.
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mart requested review of this revision.

REVISION SUMMARY
  support button icons.
  if there is no icon or is Qt 5.9, the iconItem will stay invisible

TEST PLAN
  tested with ported mediacontroller to PlasmaComponents3

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/icons

REVISION DETAIL
  https://phabricator.kde.org/D15164

AFFECTED FILES
  src/declarativeimports/plasmacomponents3/Button.qml
  src/declarativeimports/plasmacomponents3/ToolButton.qml

To: mart, #plasma
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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