Today’s “Summer Under the Stars” subject is Warren Beatty, who started as an actor, and expanded in time to become a producer, writer and director as well. His career scored hits in several different decades, as even a sample of four of his movies, shown tonight, demonstrates. Four films, four different decades, all of them worth paying attention to. At 6 p.m. ET, there’s 1967’s Bonnie and Clyde, co-starring Faye Dunaway. At 8 p.m. ET, there’s 1981&r