duo/pin.c: Add method shift_out,shift_in,pulse_in.
duo/pin.c: Add method shift_out,shift_in,pulse_in.

redbear/micropython,ganshun666/micropython,ganshun666/micropython,ganshun666/micropython,redbear/micropython,redbear/micropython,ganshun666/micropython,redbear/micropython,ganshun666/micropython,redbear/micropython