[gtk] (21 commits) Non-fast-forward update to branch kill-containers

[Matthias Clasen <matthiasc src gnome org>]

The branch 'kill-containers' 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:

  96de8be... Don't use container api on GtkListBox
  3a47e0e... testsuite: Redo listbox sort test
  f6aa957... testsuite: Fix listbox tests
  55e9131... listbox: Derive from GtkWidget
  4cacfd0... headerbar: Add gtk_header_bar_remove
  5ad7a09... Stop using container api on GtkHeaderBar
  0b6c917... headerbar: Derive from GtkWidget
  2c13cd7... Stop using container api on GtkNotebook
  328245b... notebook: Derive from GtkWidget
  29b1145... box: Add gtk_box_append/prepend/remove
  3cc8130... Replace most remaining uses of container api
  43ba188... shortcutsgroup: Drop container bits
  e1c3604... shortcutssection: Drop container bits
  595bd48... dialog: Remove code that doesn't work anymore
  9245bdd... assistant: Remove code that doesn't work anymore
  d11bb76... box: Derive from GtkWidget
  29ac2d9... Drop gtkcontainer.h includes
  2d8692b... testsuite: Drop a container api use
  c8263fa... Drop GtkContainer and its accessible implementation
  2c84499... dialog: Remove an unused struct
  dabf016... dialog: Fix up handling of action widgets

Commits added to the branch:

  66e158f... Don't use container api on GtkListBox
  1e94c5b... testsuite: Redo listbox sort test
  2b6d8f9... testsuite: Fix listbox tests
  0c9c627... listbox: Derive from GtkWidget
  9c7d72f... headerbar: Add gtk_header_bar_remove
  e91c444... Stop using container api on GtkHeaderBar
  af8ad38... headerbar: Derive from GtkWidget
  d88214f... Stop using container api on GtkNotebook
  1e99f30... notebook: Derive from GtkWidget
  194b132... box: Add gtk_box_append/prepend/remove
  c97c207... Replace most remaining uses of container api
  a52de87... shortcutsgroup: Drop container bits
  95734bc... shortcutssection: Drop container bits
  8e8b2db... dialog: Remove code that doesn't work anymore
  f83386b... assistant: Remove code that doesn't work anymore
  d660c6e... box: Derive from GtkWidget
  2870231... Drop gtkcontainer.h includes
  e993f67... testsuite: Drop a container api use
  2c855b7... Drop GtkContainer and its accessible implementation
  ac44041... dialog: Remove an unused struct
  f3e385d... dialog: Fix up handling of action widgets