(performances start on July 7) Villainous ice skaters, superhero pontiffs, a purple platypus and Napoleon congregate at this summer's incarnation of the New York Musical Theater Festival. Though home to the wacky, the outr� and the twee, the festival has sent plenty of alumni Off-Broadway and on, so that cutie buffalo or those killer eggplants might just yield the next "[title of show]" or "Next to Normal."