D14581: e a breadcrumb for multilevel kcms

[Marco Martin]

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REVISION SUMMARY
  Make the title a toolbutton, and when there are multiple levels, make
  a breadcrumb out of buttons.
  clicking on buttons will navigate the levels(keyboard shortcuts work too)
  
  a similar modification will be needed to be done to KCMShell
  depends from D14579 <https://phabricator.kde.org/D14579> and D14580 <https://phabricator.kde.org/D14580>

TEST PLAN
  Added a level to a kcm, works as intended

REPOSITORY
  R124 System Settings

BRANCH
  mart/multipageKCM

REVISION DETAIL
  https://phabricator.kde.org/D14581

AFFECTED FILES
  core/ModuleView.cpp

To: mart, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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