Firmetix

What's Changed
* Refactored serial input reading
* Reduce memory usage
* Other diverse optimisation

**Full Changelog**: https://github.com/Nilon123456789/Firmetix4Arduino/compare/v6.0.0...v6.1.0

What's Changed
* Added option to get max pin numbers
* Callbacks are now mandatory for sensors and pins
* Added custom baudrate
* Added custom send_delay

**Full Changelog**: https://github.com/Nilon123456789/firmetix/compare/v6.0.1...v6.0.2

Fix
Fixed the is_valid_pin function

**Full Changelog**: https://github.com/Nilon123456789/firmetix/compare/v6.0.0...v6.0.1

Improvement
- Added public constant with the number of digital pins and analog offering the option to use analog pin as digital input or output see [analog_output.py](https://github.com/Nilon123456789/firmetix/blob/93babda833d6fbfaea83f44f4e71c7cc39aecd65/examples/analog_output.py) example

**Full Changelog**: https://github.com/Nilon123456789/Firmetix4Arduino/compare/v1.0.0...v6.0.0