D25558: Use Transform enum internally

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REVISION SUMMARY
  Instead of using Qt::ScreenOrientation use an enum class that is directly
  mapped to KWayland's transformation enums. This simplifies the code.

TEST PLAN
  Compiles and transformations work as before.

REPOSITORY
  R108 KWin

BRANCH
  transform-enum

REVISION DETAIL
  https://phabricator.kde.org/D25558

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

To: romangg, #kwin
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