A master of disguise, an evil genius with plenty of tricks up his wings and a relentless pursuer of retribution, Feathers McGraw nests among cinema’s great villains without ever having crooned a single chirp. McGraw has been slow-cooking his revenge against Wallace and Gromit, Aardman Animations’ inventor-and-dog duo, while serving time at a zoo since “The Wrong Trousers” back in …