D17190: Add level api from Kirigami.Heading

[Marco Martin]

mart created this revision.
mart added reviewers: Plasma, VDG.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
mart requested review of this revision.

REVISION SUMMARY
  add a "level" api that has the same meaning as in the Kirigami Heading component,
  This makes easier for QWidget apps to follow the typographi HIG at
  https://www.my-scratch.de/HIG/style/typography.html
  QWidget and QML apps will look more similar and config dialogs
  the same.
  together other diffs introduces more consistency within SystemSettings
  between QWidget and QML based kcms

TEST PLAN
  ran a lot of config dialogs

REPOSITORY
  R236 KWidgetsAddons

BRANCH
  phab/heading

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

AFFECTED FILES
  src/ktitlewidget.cpp
  src/ktitlewidget.h

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