20th Century Fox is slowly giving us small tastes of their forthcoming sci-fi fantasy pic Alita: Battle Angel. The highly anticipated movie based on the Manga GUNNM by Yukito Kishiro was pushed from July to December and then they teased us at SXSW with a whole Iron City, came to Cinemacon with some footage and now they fed us more morsels of goodness at San Diego Comic-Con. Creator Kishiro welcomed the special audience, who were winners of a special scavenger hunt, to the…