The family of the 18-year-old man hurt when a 17-year-old girl crashed into his car head-on in Plymouth Thursday said he remains in the hospital one day after the violent collision. Dylan Rauch’s family describes him as a loving young man with a huge heart and passion for music, theatre, and the arts.They said he plays the flute, and had just started studying music theory at Bridgewater State University. In a statement, the University wrote in p…