D17190: Add level api from Kirigami.Heading

[Nathaniel Graham]

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

REPOSITORY
  R236 KWidgetsAddons

BRANCH
  phab/heading

REVISION DETAIL
  https://phabricator.kde.org/D17190

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