Added new menu separator item. The drawing and size handling is still done

Added new menu separator item. The drawing and size handling is still done

2001-02-21  Alexander Larsson  <alexl@redhat.com>

        * gtk/gtkseparatormenuitem.[ch]:
	Added new menu separator item. The drawing and size handling
	is still done in GtkMenuItem, but the API is a bit more sane.

	* gtk/Makefile.am:
	Add gtkseparatormenuitem.[ch].

	* gtk/gtk.h:
	Add gtkseparatormenuitem.h.

	* gtk/gtkentry.c:
	* gtk/gtkmenufactory.c:
	* gtk/gtktextview.c:
	Use the new API for menu separators.

	* demos/gtk-demo/menus.c (create_menu):
	Add some GtkSeparatorMenuItem demo code.