message: combines backlash coordinate and target coord in to same gcode string for much faster execution on robot
diff: @@ -260,10 +260,10 @@ class SmoothieDriver_3_0_0:
  self.set_power(new_power)
  if target_coords:
  + command = ''
  if backlash_coords != target_coords:
  - command = GCODES['MOVE'] + ''.join(backlash_coords)
  - self._send_command(command)
  - command = GCODES['MOVE'] + ''.join(target_coords)
  + command += GCODES['MOVE'] + ''.join(backlash_coords)
  + command += GCODES['MOVE'] + ''.join(target_coords)
  self._send_command(command)
  self._update_position(target)
  