Thursdays in July, Ronald Colman is TCM’s Star of the Month. He’s a star that may need rediscovery, as some of his most commonly known contributions to popular culture, at this point, are one step removed. He’s the actor, for example, whose voice was channeled by Don Adams when coming up with the clipped confident sound of secret agent Maxwell Smart on Get Smart. And one of Colman’s most famous early characters, a dogged detective featured in a series of movies, was name-