When starlet Anne Baxter preyed on aging stage legend Bette Davis in “All About Eve,” did anyone figure that paradigm would eventually shift to middle school? Every two years we chop down the last teen star so that a new one can rise in the sunlight. You know Stewart and Lindsay and Fanning and Fanning, Knightley and Woodley and Ronan and Breslin. But do you recall, the greatest teen-actress of all? Would it be Chloe Grace Moretz