Artist: Gorillaz Review: What happens when a cartoon rock group turns into the real thing? Twelve years ago, when Blur’s Damon Albarn started Gorillaz, it just seemed like a typical English rock star’s idea of a groovy side project — teaming with London comic-book artist Jamie Hewlett to create a fictional multi-media band. A lot of fans figured Albarn was burned out, both as a celebrity and a …