D16986: Introduce the concept of an internal window system independent id

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REVISION SUMMARY
  For supporting Wayland windows in the kwin_rules_dialog we need a way to
  pass a window id for Wayland windows to the dialog. This id needs to be
  sent to the dbus interface to query window information just like the
  interactive query. For Wayland windows we don't really have a window id
  and it would require to also pass the windowing system to
  kwin_rules_dialog and back through the dbus interface.
  
  To not complicate things this change introduces a windowing system
  independent id based on UUID. This could in future also be used
  internally for areas where it's window id based and used in both
  windowing systems.

TEST PLAN
  Adjusted test cases to verify the uuid is generated and passed to Deleted

REPOSITORY
  R108 KWin

BRANCH
  internal-id

REVISION DETAIL
  https://phabricator.kde.org/D16986

AFFECTED FILES
  autotests/integration/shell_client_test.cpp
  autotests/integration/x11_client_test.cpp
  toplevel.cpp
  toplevel.h

To: graesslin, #kwin
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