Redstone Repeater/DV

Low (1st & 2nd) bits:
 * 0x0: Facing
 * 0x1: Facing
 * 0x2: Facing
 * 0x3: Facing

High (3rd & 4th) bits:
 * 0x0: 1 tick delay
 * 0x1: 2 tick delay
 * 0x2: 3 tick delay
 * 0x3: 4 tick delay