Creates a new GtkImage displaying the file
filename. If the file isn't found or can't be
loaded, the resulting GtkImage will display a "broken image" icon.
If the file contains an animation, the image will contain an animation.
If you need to detect failures to load the file, use
GdkPixbuf::new_from_file() to load
the file yourself, then create the GtkImage from the pixbuf.
(Or for animations, use
The storage type (get_storage_type() )
of the returned image is not defined, it will be whatever is appropriate
for displaying the file.
This method must be called statically.