[gtk] (20 commits) Non-fast-forward update to branch bin-removal

[Matthias Clasen <matthiasc src gnome org>]

The branch 'bin-removal' 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:

  9173971... aspectframe: Derive from GtkWidget
  4bd53da... viewport: Add a child property
  613d9c1... Use gtk_viewport_set_child throughout
  2591cc5... viewport: Derive from GtkWidget
  e0623e5... popover: Add a child property
  14f9d1e... Use gtk_popover_set_child throughout
  5134df7... popover: Derive from GtkWidget
  4d0dfdc... scrolledwindow: Add a child property
  21032f3... Use gtk_scrolled_window_set_child throughout
  5b52cb9... scrollediwndow: Derive from GtkWidget
  a364700... builder-tool: Convert former bin children
  583f7cf... Add a test for bin child conversion

Commits added to the branch:

  233d52d... aspectframe: Derive from GtkWidget
  e1073f7... fishbow: fixup premature popover
  f795af4... aspect frame use fixup
  02fae8f... viewport: Add a child property
  590ffed... Use gtk_viewport_set_child throughout
  6bdc70e... viewport: Derive from GtkWidget
  07271a3... popover: Add a child property
  eeddfc4... Use gtk_popover_set_child throughout
  3c5d9b3... popover: Derive from GtkWidget
  5b9afee... scrolledwindow: Add a child property
  00d592c... Use gtk_scrolled_window_set_child throughout
  3c780c7... scrolledwindow: Derive from GtkWidget
  f35c31b... builder-tool: Convert former bin children
  e058224... Add a test for bin child conversion
  ff2f142... button: Add a child property
  1f480b4... Use gtk_button_set_child throughout
  f609f08... scrolled window get_child use fixup
  6d42dd4... widget: Allow resetting layout manager types
  29aedf0... checkbutton: Remove the container implementation
  d2d1e6f... button: Derive from GtkWidget