Sam Wanamaker Playhouse, LondonHeirs and spares fight under a sleazeball Roman emperor and candles take a hammering in a brilliantly provocative show with an all-female ensemble What do you do, in this sensitive age, with a play so extreme that the trigger warnings include racism, cannibalism, rape and self-harm? Even since Lucy Bailey's celebrated Globe gore-fest in 2006, the impact of Shakespeare's earliest tragedy…