A state appeals court has upheld a $3.5 million verdict for the estate of a teenager who was shot and killed outside a high school basketball game.The 1st District Appellate Court approved the award for the estate of Tyrone Lawson, who was fatally shot during a game between Chicago Simeon and Morgan Park High Schools that took place at Chicago State University in January 2013.In a 36-page opinion, Justice Mary L. Mikva wrote that a trial judge was wrong to reject several claims of immunity made by the Chicago Board of …