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PIO state machines can make a conditional jump on the state of a pin: the `JMP PIN` command. This requires the pin to be configured with `sm_config_set_jmp_pin`, but until now we didn't have a way of doing that in MicroPython. This commit adds a new `jmp_pin=None` argument to `StateMachine`. If it is not `None` then we try to interpret it as a Pin, and pass its value to `sm_config_set_jmp_pin`. Signed-off-by: Tim Radvan <tim@tjvr.org>