“Soapy” is usually a word with a negative connotation, but The Burnt Orange Heresy seems to challenge that. The film is a to-do list of soapy thematic tropes, such as using sex, deception, and even murder to drive its story, yet director Giuseppe Capotondi, screenwriter Scott B. Smith, and a great cast get away with it because the central drama is so interesting and the characters are so beguiling.