SPRINGFIELD — Gov. J.B. Pritzker signed three pro-immigration measures Friday, a promise he kept since first starting his campaign for governor.The first-year governor signed measures that will ban immigrant detention centers, works to keep Illinois families together and allows undocumented and transgender students to receive financial help for school.“Illinois is and always will be a welcoming state,” Pritzker said at the signing ceremony. “Let me be perfectly clear: [T]he state of Illinois stands …