ATLANTA — Drone enthusiasts are calling a ban on the unmanned vehicles within five miles of Georgia’s Capitol an overreach of authority by state officials, while agency officials argue the change is necessary and follows federal guidelines. It’s the latest clash between supporters of the technology and government officials balancing their desire to encourage high-tech research and development with security concerns, as federal aviation officials slowly continue developing their policies. The Georgia Building Authority’s new resolution bans “unmanned aircraft systems” within five miles of a heliport located atop a parking garage near the state Capitol building in downtown Atlanta.