By: Addison Wylie Playing It Cool has its cake and eats it too, and knows damn well what it’s doing.  However, director Justin Reardon is no David Wain or Charlie Kaufman, and Playing It Cool is nowhere near as clever as They Came Together or Adaptation. Reardon ventures into feature films with this smug rom-com send-up involving a bitter screenwriter (played by Chris Evans) who is given the task of writing a romantic comedy.  He…