Apple has hired long-time IGN editor Matt Casamassina to help manage the App Store’s games section. Casamassina worked at IGN for over a decade, focusing primarily on Nintendo; his official title at Apple will be global editorial games manager, App Store. “I will be leading the charge for games on the App Store, so whether you browse through iTunes, iPhone, iPod Touch or iPad, the games content you see will be handpicked and organized…