D22195: Split Compositor class in Wayland and X child classes

romangg created this revision.
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REVISION SUMMARY
  This is a first rough split-up of Compositor class. It works but there is
  possible more functionality that could be put into one of the child classes
  only.

TEST PLAN
  Manually X from VT and Wayland nested.

REPOSITORY
  R108 KWin

BRANCH
  compositorSplit

REVISION DETAIL
  https://phabricator.kde.org/D22195

AFFECTED FILES
  autotests/integration/kwin_wayland_test.cpp
  composite.cpp
  composite.h
  dbusinterface.cpp
  main.cpp
  main.h
  main_wayland.cpp
  plugins/platforms/x11/standalone/screens_xrandr.cpp
  workspace.cpp

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