Dr. Roland Riley, a chiropractor in Annapolis for close to a half century, was a man of deep and quiet loyalties. He was also a theater lover.     A 1942 graduate of Annapolis High School, he returned as a dedicated performance-goer after his alma mater’s transformation to Maryland Hall for the Creative Arts.     At The Colonial Players, Dr. Bob — who did not care for his given name — took a more active role. There, he was a volunteer sound...