Allow inversion of input GPIO #997
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This PR enables users of the input GPIO to switch the on/off values.
Rationale:
The ESP8266 uses internal pull-up for input GPIO. A common use case is to use a switch to pull the input to ground. So the value is
LOWwhile the button is pressed andHIGHotherwise.Swapping the values for
INPUT_GPIO_ON_VALUEandINPUT_GPIO_OFF_VALUEintroduced in this PR, makes aLOWbutton report asOn.