SPRINGFIELD — An attorney involved in a federal class-action lawsuit against Aurora volleyball coach Rick Butler outlined new rules he said will stymie the “epidemic” of sexual assault instances in youth sports.At a state Senate hearing Tuesday aimed at addressing sexual harassment and discrimination, lawyer Jay Edelson pushed for legal changes to prevent slander suits against victims and penalty changes for those who lie about instances of sexual abuse against children.The managing partner at Edelson P.C …