SPRINGFIELD — Thomas R. Fitzgerald wasn’t merely bothered by widespread corruption in the court system revealed by a federal investigation in the 1980s. He seemed haunted by it.So much so, his successor on the Illinois Supreme Court said Wednesday, that Fitzgerald dedicated the rest of his career to building professionalism and trying to restore public trust in the judiciary. He founded the Illinois Judicial Ethics Committee, pushed new evaluation programs for trial judges, broadened judicial mentoring and honed new rules …