SPRINGFIELD — With the fate of school funding still up in the air, a group of parents is asking a judge to force some of the action.Parents from across the state filed suit this week to release hundreds of millions of dollars in certain school payments and block any attempt to circumvent reforms to the way schools are funded going forward.Their 13-page filing in Cook County court on Thursday seeks a writ of mandamus against the state’s comptroller, demanding she release money earmarked for transportation …