Fix active low behavior of GPIO output pins #61
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When an output pin is in active-low mode, the try_set_low and try_set_high functions currently incorrect behavior.
In keeping with the input behavior for
try_is_highandtry_is_low, "high" and "low" should refer to the actual output voltage. This works as expected for pins that are not in active-low mode, but if a pin is in active-low mode, then the opposite happens:try_set_lowsets the voltage hightry_set_highsets the voltage lowThis bug and the fix have been verified using this test program.