Marvel fans can be happy: Shang-Chi is officially back in the Marvel universe – and his comeback is double. As director Destin Daniel Cretton now reveals in conversation with ScreenRant, "Shang-Chi 2" is finally in active development. So it is clear: The hero played by Simu Liu (37) will survive "Avengers: Doomsday". In the first trailer for the mega event, Shang-Chi is already in a spectacular duel with Gambit, played by Channing Tatum (46), to…