[gtk] (14 commits) ...Merge branch 'wip/otte/dnd' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  b0f6996... gdk: Remove gdk_surface_register_dnd() (*)
  992173c... x11: Register DND atoms with all other atoms (*)
  a19066b... filechooserwidget: Stop using selection data (*)
  a4f7e2c... droptarget: Remove selectiondata read functions (*)
  a62d78b... selection: Remove GtkSelectionData (*)
  6442ec2... gdk: Remove gdk_utf8_to_string_target() (*)
  6c61c7b... Don't use GdkAtom where const char * is used (*)
  28dced5... gdk: Remove gdk_text_property_to_utf8_list_for_display() (*)
  4280ca2... device: gdk_device_list_axes() => gdk_device_get_axis_names (*)
  6e935d4... x11: Get rid of GdkAtom and APIs supporting it. (*)
  60307da... wayland: Replace final mention of GdkAtom (*)
  f536cf0... win32: Get rid of GdkAtom (*)
  cc7c1fe... gdk: Remove GdkAtom (*)
  9036d49... Merge branch 'wip/otte/dnd' into 'master'

(*) This commit already existed in another branch; no separate mail sent