“Cabaret” could never be mistaken for a sunny musical, or a wholesome one. Since having its premiere on Broadway in 1966 — and particularly since Bob Fosse’s masterful screen adaptation arrived, six years later — Kander and Ebb’s darkly glittering portrait of Weimar-era Berlin, based on the play “I Am A Camera” and stories by Christopher Isherwood, has been inspiring saucy and dystopian visions on both sides of the Atlantic.