Video games are littered with drones, mindless characters in the background known as NPCs, a non-player character. But what if one of those NPCs gained agency all of a sudden, had a voice and became free of the constraints and limitations of background slavery? That’s the premise, essentially of “Free Guy,” a new high-concept, hi-tech science-fiction action comedy comedy from director Shawn Levy (The “Night at the Museum” series, and “Stranger Things”) starring Ryan Reynolds.