The CW has renewed virtually its entire slate of shows for the 2020-21 season, which is putting them on track to finish out the broadcast year with zero cancellations for the second year in a row. That doesn’t mean none of its shows are going away - long-running hits Arrow, Supernatural, and The 100 are all concluding this year. And while the Riverdale spin-off Katy Keene hasn’t technically been renewed and doesn’t premiere until February, the network has already ordered 13 additional scripts, which is a good indication that it will also be brought back …