20th Century Studios, which used to be known as 20th Century Fox, has named veteran executive Steve Asbell as its new president of production. He replaces Emma Watts, who left the studio last month. Additionally, Vanessa Morrison has been named president of streaming at Walt Disney Studios, where she will oversee the development and production of Disney+ film content. Asbell has been with the studio since 2002 and has worked on some of its biggest titles since then, including Ridley Scott's The Martian, and a pair of James Mangold movies -- Logan and Ford v Ferrari. He's currently overseeing …