Figure skater Alysa Liu shocked the skating world last year , when she took home the World Championship just a few years after announcing her retirement from the sport at the age of 16. As she heads into the Winter Olympics next month, where she is a favorite to win gold, the 20-year-old Liu has a new look and a new approach. Liu, no longer a young prodigy taking orders from the adults around her, is making this comeback on her own terms.   "I get to pick my own program music. I get to help