The nature of terrorism is evolving, with technology at the forefront of the shift, according to former Boston Police Commissioner William Bratton.“Twenty-five years after 9/11, it’s a very different world than existed at the time,” Bratton, who also served as New York Police Commissioner, twice, and Los Angeles Police Chief, told the Herald just a few days after the anniversary. “The threat picture has changed dramatically.” The attack on the Twin Towers and the Pentagon and the hijacking of Flight 93, which resulted in the death of nearly 3,000 people, really changed the approach to terrorism law enforcement took, he…