D23489: Get output position and scale from output device interface

romangg created this revision.
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REVISION SUMMARY
  Let the data saved in OutputDeviceInterface be the single source of truth
  and as low hanging fruits first do this for global position and scale.

TEST PLAN
  Nested Wayland, Drm, virtual backends tested.

REPOSITORY
  R108 KWin

BRANCH
  outputDeviceData

REVISION DETAIL
  https://phabricator.kde.org/D23489

AFFECTED FILES
  abstract_wayland_output.cpp
  abstract_wayland_output.h

To: romangg, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart