[gtk] (12 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  1d8096d... docs: Stop referring to the Quartz backend
  8e13284... docs: Include GDK_WINDOWING_MACOS
  3fd3c7b... gdk: Drop GdkPoint from the api
  46c2013... docs: Add some detail to GdkTexture docs
  e932742... docs: Tweak GdkPaintable docs
  1124bac... docs: Cosmetics
  56c577d... docs: Small additions for GdkCursor docs
  7ec7220... docs: Tweak frame clock docs
  ad68b37... docs: Tweak GdkSurface docs
  4f0e652... docs: Tweak GdkPopup docs
  a42a733... docs: Tweak GdkToplevel docs
  f78bbe5... docs: Some restructuring

Commits added to the branch:

  29ccd13... docs: Stop referring to the Quartz backend
  3617fba... docs: Include GDK_WINDOWING_MACOS
  574a3a4... gdk: Drop GdkPoint from the api
  1f8d593... docs: Add some detail to GdkTexture docs
  838d092... docs: Tweak GdkPaintable docs
  9f71bdd... docs: Cosmetics
  2df3822... docs: Small additions for GdkCursor docs
  d2adbad... docs: Tweak frame clock docs
  3afd5d7... docs: Tweak GdkSurface docs
  94305f2... docs: Tweak GdkPopup docs
  ce78d0c... docs: Tweak GdkToplevel docs
  3164f32... docs: Some restructuring