2003-10-10  Michael Natterer  <mitch@gimp.org>

	* app/widgets/Makefile.am
	* app/widgets/widgets-types.h
	* app/widgets/gimpdocked.[ch]: new files implementing
	GimpDockedInterface, a GTypeInterface which must be implemented by
	all widgets which want to be packed into a GimpDockable. Has
	virtual functions similar to the ones GimpDockable had.

	* app/widgets/gimpdockable.[ch]: removed all virtual functions and
	all function pointers from the instance struct (also the ones just
	added in the commit below). Make sure only widgets implementing
	the GimpDockedIface are added and simply call the child's
	GimpDocked functions where we used to call our own virtual
	functions and function pointers.

	* app/widgets/gimpcoloreditor.c
	* app/widgets/gimpcontainereditor.c
	* app/widgets/gimpcontainergridview.c
	* app/widgets/gimpcontainerview.c
	* app/widgets/gimpeditor.c
	* app/widgets/gimpimageeditor.c
	* app/widgets/gimpitemtreeview.c
	* app/widgets/gimpsessioninfo.c
	* app/widgets/gimptooloptionseditor.c
	* app/display/gimpnavigationview.c: implement GimpDockedIface.

	* app/gui/dialogs-constructors.c: removed all that get_preview_func(),
	set_context_func() etc. cruft since that's done by GimpDockedIface.
	It's really a file of constructors now.

	* app/gui/dialogs-menu.c: changed accordingly.

	* app/widgets/gimpimagedock.c: forgotten in the commit below.