DETROIT — Two years after a teen gunman opened fire at Oxford High School, killing four students and injuring seven others, victims of the shooting and even those who were not directly injured will have a chance to tell a judge on Friday how it affected their lives. Friday’s sentencing of Ethan Crumbley in Oakland Circuit Court marks the first case in the nation in which a school shooter has been convicted of terrorism. The decision by Oakland County Prosecutor Karen McDonald to bring a state terrorism charge against Crumbley in the Nov. 30, 2021, shooting means all victims — regardless of phy…