SPRINGFIELD — The Illinois Supreme Court heard oral arguments Tuesday to a constitutional challenge to the state’s law regulating gun licenses.The justices appeared divided on the question of whether this case should be presented in state or federal court since the state’s Firearm Owners Identification Card Act incorporates federal law.Several justices asked questions that indicated support for the argument advanced by the plaintiff, Shawna Johnson.Johnson was unable to purchase a handgun in Indiana in July 2012 due to a …