A decaying submarine, a beloved old restaurant and one of the state’s oldest inns top this year’s list of the most endangered historic sites in New Jersey. The annual list was released by Preservation New Jersey on Tuesday, based on nominations from the public. Founded in 1978, Preservation New Jersey is a nonprofit group that promotes the state’s diverse communities through advocacy and education. Places on the annual list must fit three criteria, including historic significance and architectural integrity, the critical nature of the threat identified and the likelihood that inclusion on the …