NORWALK — After two decades in the corporate world, Tom Forst had had enough. So when his wife told him they’d finally paid off the last of their children’s college tuition, his response, naturally, was, “I’m quitting.” That was eight years ago. Back when he had a tight haircut and wore a full suit to work every day. Back when the idea of playing music full time was nothing more than a daydream supplied by a memory. With the blessing of his wife, Forst gave his six months not