Yoruba Richen, whose movie “How It Feels To Be Free” (PBS Documentaries Prime Video Channel) tells the story of six African-American icons: Lena Horne, Abbey Lincoln, Nina Simone, Diahann Carroll, Cicely Tyson and Pam Grier, all of whom insisted on owning their artistic spaces on their own terms, and who are the forerunners for the opportunities that so many of us have today.