Show of hands: Who’s planning to see this weekend’s big movie? That was a trick question. Because with screens getting smaller, choices getting wider and audiences getting narrower, the entire notion of “big movie” has become exponentially more difficult to define. No doubt, such worldwide behemoths as “Beauty and the Beast” and “The Fate of the Furious” count as big movies, if only in deference to their budgets, spectacle and wide-ranging appeal.