Fast, sleek and opulent, the legendary liner inspired the name of a beer — “Hurray for the Rex! The greatest thing the regime ever built!” In Fellini’s Oscar-winning 1973 movie Amarcord, the SS Rex comes out of the darkness, glistening with lights like a giant Christmas tree. The crowd awaiting her passage cheers, claps, waves hats and handkerchiefs— some even shed a tear —…