Wrap panic handler to prevent spurious door openings. #70
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When the GDO-BlaQ is restarted by software through a watchdog timeout or
abort()orassert()the reset process can leave the UART TX in a HIGH state, which causes the output to go LOW, triggering the garage door to open/close unexpectedly. This adds a wrapper around the panic handler which switches the UART TX pin to a digital input with pulldown enabled which will cause the output to remain HIGH and avoid triggering the door.