[gtk+] (10 commits) Non-fast-forward update to branch wip/baedert/gtk-widget-destroy

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/gtk-widget-destroy' 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:

  ccc8070... window: Add gtk_window_destroy
  8f4f5e6... gtk: Stop using gtk_widget_destroy
  7465588... GdkEvent: Unref user_data in free
  2d93f08... Stop using gtk_widget_destroy everywhere
  5b2e452... widget: Remove gtk_widget_destroy
  0abe68a... testsuite: add widget refcount test case
  94c6650... build: Add missing action-namespace example
  30676be... testdnd2: Adapt to widget changes
  a7effb4... GdkEvent: OWNER_CHANGE events have a selection as well
  aca12a4... GtkWindow: Remove _set_has_user_ref_count

Commits added to the branch:

  dd4e7b0... window: Add gtk_window_destroy
  a116f62... gtk: Stop using gtk_widget_destroy
  53523c2... GdkEvent: Unref user_data in free
  bba7df9... Stop using gtk_widget_destroy everywhere
  673b04a... widget: Remove gtk_widget_destroy
  366c321... testsuite: add widget refcount test case
  8e275d4... build: Add missing action-namespace example
  8204089... testdnd2: Adapt to widget changes
  3139b7a... GdkEvent: OWNER_CHANGE events have a selection as well
  e3833e2... GtkWindow: Remove _set_has_user_ref_count