Lorne Michaels , the legendary creator of “Saturday Night Live,” has allowed Morgan Neville behind-the-scenes of his television empire. The resulting film, “Lorne,” is getting released by Focus Features on April 17. Neville, an Oscar-winning filmmaker, is no stranger to TV icons, having directed “Won’t You Be My Neighbor,” an acclaimed look at Fred Rogers. He also executive produced last year’s “SNL 50: Beyond Saturday Night,” a Peacock series about the history of Michaels’ sketch show. Focus,