By Daniel Kline The upcoming first member of thr Icon Class will be the latest ship to claim the “biggest in the world” title. When Oasis of the Seas first went into service in 2008, it changed the concept of what a cruise ship could be. Instead of just being bigger than the previous biggest class of ships, Oasis class added a variety of never-before-seen features. The outdoor Central Park and Boardwalk areas were perhaps the most obvious changes, but the entire ship was a revelation. The neighborhood concept, which has been carried forward with Royal Caribbean International’s (RCL) – Get Roya…