HeaderBar: Wrap child properties

	* gtk/src/gtk_signals.defs: Add definitions for "pack-type", and
	"position" child properties.
	* gtk/src/headerbar.hg: Add wrappers for the aforementioned
	child properties.
	* See https://bugzilla.gnome.org/show_bug.cgi?id=140515
Paned: Wrap child properties

	* gtk/src/gtk_signals.defs: Add definitions for "resize", and
	"shrink" child properties.
	* gtk/src/paned.hg: Add wrappers for the aforementioned child
	properties.
	* See https://bugzilla.gnome.org/show_bug.cgi?id=140515