SPRINGFIELD — The state’s high court heard arguments Tuesday on whether the public can have access to documents from a special prosecutor’s criminal investigation into former mayor Richard M. Daley’s nephew.Daley made statements to special prosecutor Daniel K. Webb during the investigation into Richard “R.J.” Vanecko, who pleaded guilty to fatally punching David Koschman outside a North Side bar in 2004.Daley ended his 22-year run as mayor in 2011.A Cook County judge in 2012 appointed …