By: Addison Wylie What do you say about a movie that can be summed up in a baffled head shake? You’ll find yourself doing that a lot if you dare endure Tommy Wirkola’s Hansel & Gretel: Witch Hunters. The premise for this unnecessary new spin on the classic fairy tale feels like a studio executive playing a game of chicken with Hollywood – seeing just how far they could take a ridiculous story and milk…