Handle the DefineFontName tag.

def _handle_tag_definefontname(self):
        """Handle the DefineFontName tag."""
        obj = _make_object("DefineFontName")
        obj.FontId = unpack_ui16(self._src)
        obj.FontName = self._get_struct_string()
        obj.FontCopyright = self._get_struct_string()
        return obj