★★☆☆☆   Confusing. Haphazard. Far-Fetched. Convoluted.   For centuries, such words have been used repeatedly to describe Cymbeline, Shakespeare’s rarely staged late tragicomedy that is being performed on the Boston Common by Commonwealth Shakespeare Company through Aug 4. George Bernard Shaw even famously called it “stagy trash.”   Trash, I’m not sure, but it […]