D8232: Add option to center shadow

[Marco Martin]

mart added a reviewer: VDG.

REPOSITORY
  R31 Breeze

REVISION DETAIL
  https://phabricator.kde.org/D8232

To: rpelorosso, #breeze, #vdg
Cc: mart, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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