The smack of the football in a receiver’s hands, the percussive thud of runners’ feet on the straightaway, the roar of spectators as the tape is broken or the ball goes through the uprights: these things don’t change. Other things do. Wesleyan athletes returning to campus this month were greeted by a sparkling new artificial turf field and track, glistening almost in Technicolor behind Freeman Athletic Center. The $1.6-million facility, funded by more than 100 generous supporters, will be home not just to track meets and everyday runners, but will serve as a practice surface for the football and other…