Added a render_icon virtual method.

Added a render_icon virtual method.

2003-11-19  Federico Mena Quintero  <federico@ximian.com>

	* gtk/gtkfilesystem.h (struct _GtkFileSystemIface): Added a
	render_icon virtual method.

	* gtk/gtkfilesystem.c (gtk_file_system_render_icon): New function.

	* gtk/gtkfilesystemunix.c (gtk_file_system_unix_render_icon):
	Implement as a stub for now.

	* gtk/gtkfilechooserdefault.c (shortcuts_insert_path): Use
	gtk_file_system_render_icon().
	(list_icon_data_func): Likewise.
	(toolbar_create): Set the toolbar style to icons only.

	* gtk/gtkfilechooser.c (gtk_file_chooser_add_shortcut_folder_uri):
	Fix doc comments.