A packed library meeting in Roanoke County offered a look at how deeply troubled some Virginia residents are by Flock's automated license plate readers. What police may see as a routine crime-fighting tool has become, for critics, a symbol of constant tracking without consent. Here's what to know According to reporting by the Roanoke Star, more than 75 people showed up at Roanoke's South County Library to protest the Flock Safety camera network…