SACRAMENTO, Calif. — All three murder suspects in the downtown Sacramento gang shootout appeared in court on Tuesday, gathering for what will be the defendants’ last hearing until early September. Sacramento prosecutors charged Mtula Payton, 28, and brothers Smiley Martin, 27, and Dandrae Martin, 26, in May with three counts of murder for the deaths of three women killed in crossfire during the April 3 shooting. During Tuesday’s hearing, defense attorneys were granted additional time to receive and review the mountain of digital evidence related to the shooting, including thousands of hours of…