D17756: [wayland] XdgDecoration Support

davidedmundson created this revision.
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REVISION SUMMARY
  Does something similar to our existing ServerDecoration, but based
  around XDG Shell patterns and with a few subtle differneces.
  
  We'll probably still need both in kwin for the forseeable future as GTK3
  won't ever change from using the KDE Server Decoration.

TEST PLAN
  Relevant unit test. It's a bit simpler as spec states
  toolkits must follow what the compositor configures if they
  bind the interface.
  
  Modified plasma-integration to remove ServerIntegration 
  (as Qt5.12 has native support) all my windows look and act the same.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17756

AFFECTED FILES
  autotests/integration/kwin_wayland_test.h
  autotests/integration/shell_client_test.cpp
  autotests/integration/test_helpers.cpp
  shell_client.cpp
  shell_client.h
  wayland_server.cpp
  wayland_server.h

To: davidedmundson, #kwin
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