Change of license, addition of mqtt and optimization
This version contains:
- Added asynchronous mqtt client,
- Reorganization of sources to activate/deactivate parts directly from main.py, in order to reduce the memory footprint for generic esp32,
- Based on the recently released micropython 1.20,
- Improved responsiveness on telnet and http server,
- I have changed the license agreement, I deliver this software free of charge and without guarantee, and I do not wish to be held responsible for misuse.