One of my favorite classic movies of the 1940s is “Everybody Comes to Rick’s.” You may know it under its final production name — “Casablanca.”Filmed in the exotic back lot of Warner Bros. Studios, “Casablanca” achieved its international flavor with a cast that featured outstanding foreign actors who had fled Nazi oppression for Hollywood.Internationalism still provides a critical backdrop for the film industry. But as I learned at the Toronto International Film Festival in …