SYDNEY — Amid a barrage of gunfire, police stormed a cafe in the heart of Sydney today to end a 16-hour hostage siege by an Iranian-born gunman. Police said three people were killed — the gunman and two of the hostages — and four others were wounded. Police raided the Lindt Chocolat Cafe after they heard a number of gunshots from inside, said New South Wales state police Commissioner Andrew Scipione. “They made the call because they believed that, at that time, if they didn’t enter …