Ronald Colman, TCM’s star of the month, continues to be saluted tonight, and the opening film, from 1947, is a particularly bold and unusual showcase. In it, he stars as an actor whose latest part, opposite an actress played by Signe Hasso, is the title role in Shakespeare’s Othello – a role that begins to consume him, and overtake him, even when he’s not performing the scenes. (You know what they say: Once you go black…) He begins to lose touch with reality, gets