Creates a new pixbuf by loading an image from a file.
The file format is detected automatically.
If `NULL` is returned, then
error will be set. Possible errors are:
- the file could not be opened - there is no loader for the file's format - there is not enough memory to allocate the image buffer - the image buffer contains invalid data
The error domains are `GDK_PIXBUF_ERROR` and `G_FILE_ERROR`.
Name of file to load, in the GLib file name encoding
A newly-created pixbuf