Carol Thompson is stepping out of her perennial starring role in the three-actor stage version of “Driving Miss Daisy” for a different role at the Averitt Center for the Arts, as its interim executive director. Thompson, who retired one year ago as director of Georgia Southern University’s Performing Arts Center, has been involved in various ways with the Averitt Center since its formative phase. Her turn as interim director began Monday, after Tim Chapman, who was the Averitt Center’s first executive director and held the job 13 years, departed Friday for his new post as manager of the Carrollton Cultural Arts Center in Carrollton.