rpi_ws281x.py: added option to turn off cleanup atexit register #117
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Suggesting this change as this causes a segmentation fault for users with their own atexit functions, particularly ones that modify the LEDs on exit (like flashing red prior to exit with a known error).
By default or when True, this change maintains interoperability with existing code by cleaning up the LED strip when the user terminates the program or it terminates unexpectedly.
When False, the atexist.register is not called and the cleanup function is exposed as cleanup rather then _cleanup.