/*
 * Returns a new Imlib2::Font
 *
 * Note: the specified font must be in the font path.  See
 * Imlib2::Font::list_paths() for a list of font paths, and
 * Imlib2::Font::list_fonts() for a list of fonts.
 *
 * Examples:
 *   font = Imlib2::Font.new 'helvetica/24'
 *   font = Imlib2::Font.load 'helvetica/24'
 *
 */
VALUE font_new(VALUE klass, VALUE font_name) {