Get a HaruFont instance.
The name of the font. See Builtin Fonts for the list of builtin fonts. You can also use the name of a font loaded via HaruDoc::loadTTF, HaruDoc::loadTTC and HaruDoc::loadType1.
The encoding to use. See Builtin Encodings for the list of supported encodings.
Returns a HaruFont instance with the specified fontname and encoding.
Throws a HaruException on error.