A little over ten years ago, John Rzeznik, lead singer of the Goo Goo Dolls, wrote “I’m Still Here (Jim’s Theme)” for the Disney animated feature “Treasure Planet.” The song became so popular that you’d have been hard-pressed to find anyone who couldn’t sing a few bars of it. It was a solo production for Rzeznik, which is fitting, since the lyrics are so deeply personal. Rzeznik drew from his own experience to write from lead character Jim Hawkins’ point of view. He connected so strongly with Hawkins, in fact, that he says he still feels as connected with him — and with the son