D26311: Handle output logical size changes

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REVISION SUMMARY
  The logical size of an output can be explicitly set through the output
  management protocol. In this case calculate a view geometry, that is centered
  on the output.

TEST PLAN
  Tested with two outputs having different aspect ratios.

REPOSITORY
  R108 KWin

BRANCH
  logical-size

REVISION DETAIL
  https://phabricator.kde.org/D26311

AFFECTED FILES
  abstract_wayland_output.cpp
  abstract_wayland_output.h
  plugins/platforms/drm/drm_output.cpp
  plugins/platforms/drm/egl_gbm_backend.cpp

To: romangg, #kwin
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