Gary Caldwell, who returned to the League One club in February to keep them up, faces a new season with meticulous plans and bright hopes “This is the only rule I’m going to have for yous all season: ‘team first’,” says Gary Caldwell. The Wigan head coach’s Scottish accent booms over the gentle hum of a projector in a darkened classroom at the club’s Christopher Park training ground. “That is the one thing that we cannot ever go against,” he says, pointing to a slide on screen. “The team is the…