Elsa Keslassy International CorrespondentGaumont is set to unveil sprawling period thriller “The Colors of Fire,” based on Pierre Lemaitre’s international bestseller.“The Colors of Fire” is headlined by a prestigious cast, including Lea Drucker (pictured), the Cesar-winning actor of “Custody,” as well as Benoit Poelvoorde (“Sink or Swim”), Olivier Gourmet (“Karl Marx”), Fanny Ardant (“DNA”), Alice Isaaz (“Elle”) and Clovis Cornillac (“Little Tickles”).Set for delivery in the second half of