A security enforcer droid sits in the "sidekick" spot in the next big Star Wars film - here's what he's all about. He goes by the name K-2SO, Kay-two ess-oh, and he's a security droid. He's got a fully articulated head (swiveling on a joint with more movement than, for example, C-3PO), and he's taller than an average human. He's …