More broadly, though, this sour-smell-of-success story…is steeped in a sense that Chaplin the person, as opposed to Chaplin the fabled silent comedian, has gone missing in action, devoured by a swarm of man-eating clichés….The lens through which we see most of “Chaplin,” though, is blurred, as if with Vaseline. In his 1964 autobiography Chaplin made it clear that he had little use for most interpretations of his psyche, whether high-brow (via Freud or W. Somerset Maugham) or low (the gutter press and fan magazines). So I shudder to think what he might have made of the psychiatrist’s couch he’s been plopped on for “Chaplin: The Musical.”