What could be new about a tale as old as time? The beauty of Disney’s live-action retelling of “Beauty and the Beast” resides in the visually spectacular, digitally enhanced, Rococo-themed production design. The movie is bedazzled, gilded and bejeweled in every over-stimulating frame — then it’s 3D amplified for immersive effect.Disney may tug a bit at the corners of this canonic fable, adding a gay character here and some girl empowerment there. But there is little it could do to &ldquo …