Actress-singer Ryan Destiny, who played Alex Crane Jones on Fox's Star, has been cast as Olympic champ Claressa 'T-Rex' Shields in Universal's boxing movie Flint Strong, Collider has learned. The project boasts a powerhouse trio behind the camera, as Oscar-nominated cinematographer Rachel Morrison (Mudbound) will make her feature directorial debut from a script by Oscar-winning writer Barry Jenkins (Moonlight), while Michael De Luca (The Social Network) will produce via his eponymous banner. Flint Strong is based on the 2015 documentary T-Rex from Zackary Canepari and Drea Cooper. The documentary followed 17-year-old …