Goth-dressed fantasy fans? Be prepared for a long line. Political thriller junkies? Dust off your old paperback Clancy copies. Parents of Princess Diaries-obsessed young ones? Ready your little girls. The lineup has been announced for the National Book Festival, to be held on September 24 from 10-5 p.m. on the mall and sponsored by the Library of Congress. This year’s lineup is a mix of favorites from years past and new appearances from esteemed authors….