In a ruling a lawyer on the winning side described as a “game changer,” a divided 7th U.S. Circuit Court of Appeals held Tuesday that discrimination in the workplace based on sexual orientation violates federal law.The Chicago-based court is the first federal appeals court in the nation to hold Title VII of the Civil Rights Act of 1964 prohibits discrimination against lesbians, gays and bisexuals.The 7th Circuit’s ruling creates a split among the appellate courts, with nine other courts reaching a …