MicroPython logging module

A small and simple implementation of Pythons logging module. Avoids having to use print() statements in your code for logging and debugging. Many MicroPython versions exist, this one is as much as possible stripped of ballast I don't use to reduce its size. See demo.py and the resulting demo_output.txt for its workings. To use copy logging.py to your device in your working directory or (better) somewhere in sys.path.