The Shore town is trying to cash in on its kitschy 1950s architecture.   Wildwood's honky-tonk commercialism copped some clout when Ivy League students and a noted architect three years ago began an urban-design study of the place.     The team concluded that the resort harbored the world's largest number of buildings in the flamboyant Doo-Wop, Googie and Populuxe styles of architecture that made their marks during the second half of the 20th century.