Henry Cavill wants to continue playing Superman for "years to come," the star of Man of Steel, Batman v Superman: Dawn of Justice and Justice League has said in a new interview. The 37-year-old British actor sat down with Patrick Stewart for Variety's Actors on Actors issue, and Stewart knows a thing or two about playing an iconic superhero, having played Professor Charles Xavier in seven X-Men movies. It was director Zack Snyder who cast Cavill as Superman, and the actor first donned the red cape for 2013's Man of Steel -- his only solo outing …