Filament Sensors: Add switch_pin_state status variable

[Gunner087]

Added a switch_pin_state status variable to the RunoutHelper class. Variable state is modified by _button_handler() in SwitchSensor and encoder_event() in EncoderSensor.

This allows a macro to read the logic state of the switch_pin for filament_switch_sensor and filament_motion_sensor. In my case, I wanted this functionality in order to write a macro that tracks the motion of the filament during a purge in the START_PRINT macro. That way I can check if the extruder is working properly before the print starts. Checking filament extrusion during filament load or unload macros is also possible.

[Gunner087]

Closed, found a better solution