Cops are searching for the vigilante gunman who allegedly fired off shots while trying to stop a vagrant from robbing a woman at the Times Square station – as officials warned Wednesday that ongoing subway violence “will not be tolerated.” The would-be mugger, identified as Matthew Roesch, 49, was charged with attempted robbery for trying to “forcibly” snatch the 40-year-old victim’s belongings at the 49th Street N, R and W station around 9:15 p.m. Tuesday, police said. The unidentified bystander stepped in — and allegedly opened fire toward the homeless man, according to cops. No one was struck. “I’ve looked...