SPRINGFIELD — For all the fanfare and the legal rigmarole of Illinois’ ban on semiautomatic weapons, it might come as a surprise to learn the legislation was titled “Insurance Code-Public Adjusters.”To thousands of gun owners and merchants who filed lawsuits over it, the title exemplifies the way legislators cut corners last month to enact the legislation prompted by the deadly Independence Day parade shooting in Highland Park.The ban on dozens of semiautomatic rifles and handguns took effect …