We’re happy to be able to say this at the start of this week’s gaming edition of iPhone Gems: there’s a lot of good and interesting stuff in here. We begin with a review of Gameloft’s Gangstar—a very substantial clone of Rockstar’s Grand Theft Auto 3—and continue with shorter reviews of the side-scrolling alien shooter Inkvaders, a 3-D rendition of the classic board game Battleship called iSink U, and a highly…