D17350: Add the missing api for multilevel KCMs to control the columns

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  - add currentIndex and depth, which would map to the view in SystemSettings using a Kirigami PageRow (but not necessarly)
  
  - On multilevel kcms, Fix layout alignment issues that would prevent
  
  ScrollViewKCM and SimpleKCM when displayed one besides the other to look
  aligned with each other

TEST PLAN
  tested most current QML kcms, tested the new features extensively
  with the QML networkmanager kcm rewrite

REPOSITORY
  R296 KDeclarative

BRANCH
  phab/missingapi

REVISION DETAIL
  https://phabricator.kde.org/D17350

AFFECTED FILES
  src/qmlcontrols/kcmcontrols/qml/ScrollViewKCM.qml
  src/qmlcontrols/kcmcontrols/qml/SimpleKCM.qml
  src/quickaddons/configmodule.cpp
  src/quickaddons/configmodule.h

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