A white Chicago police officer who shot a black teenager 16 times was charged with murder today, just a day before the deadline a judge set for the city to release a squad-car video of the killing that officials fear will spark unrest.The Cook County state’s attorney’s office said in a statement that officer Jason Van Dyke was charged with first-degree murder in the Oct. 20, 2014, killing of 17-year-old Laquan McDonald. Associate Judge Donald D. Panarese Jr. denied him bond at a noon hearing.City officials and …