DOVER, Del. - Here in the capital city of the nation's first state, gambling-industry heavyweights gathered to confer for three days last week to discuss the suddenly hot status of American racetracks. The heat has nothing to do with the pick six scandal consuming most horseplayers' interest these days, but with the increasingly clear direction that tracks will be taking in the years ahead - a direction perfectly embodied by the site of the conference, Dover Downs.