PHOTOS BY EVAN ZIMMERMAN FOR MURPHYMADE From left, “Clue” cast members include Donna English as Mrs. White, John Treacy Egan as Col. Mustard, Michael Kostroff as Prof. Plum, Alex Mandell as Mr. Green, Kathy Fitzgerald as Mrs. Peacock, Sarah Hollis as Miss Hollis and Mark Price as the butler Wadsworth. Watching “Clue” at the Paper Mill Playhouse in Millburn, you will likely be too busy laughing to worry about whodunit. “Clue” is technically a murder mystery. But it bears more or less the same relationship to typical Agatha Christie-style mysteries as “Blazing Saddles” does to classic Hollywood …