D25912: Reverse shared context logic on GLX

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REVISION SUMMARY
  Currently we create Qt GL contexts that share with the core kwin
  context.
  
  If we do it the other way round, then with a special flag /any/
  QQuickWindow will share context. Making life easier there.
  
  On wayland our contexts are shared by default anyway as we control the
  creation.
  
  EffecttQuickView then only needs a boolean to decide whether to use the
  shared texture path or the blitting path.
  
  This is IMHO cleaner, but the other advantage is that it will allow 
  D23881 <https://phabricator.kde.org/D23881> to use the kwin context creation path and get a shared context.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D25912

AFFECTED FILES
  libkwineffects/kwineffectquickview.cpp
  libkwineffects/kwineffectquickview.h
  main_wayland.cpp
  main_x11.cpp
  plugins/platforms/x11/standalone/glxbackend.cpp
  scene.cpp

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