The final “Lizzie McGuire” episode aired on Valentine’s Day 2004. Yet, more than 20 years later, Hillary Duff has remained a fixture in the hearts and minds of elder Millennials. And, now for the first time since 2008, she’s going on an official tour. From Jan. 19-29, the former Disney Channel icon will perform four concerts as part of her ‘Small Rooms, Big Nerves Tour’ in the U.S., Canada and Great Britain. That includes a show at Brooklyn’s Brooklyn Paramount on Tuesday, Jan. 27. “It’s