Arduino script should print its version #20
Description
Maintenance requires that it is possible to recognize the firmware version the Arduino is running, so the script should print its version to the serial monitor. Also, the version it prints should be equal to the tag version in the git repository. Getting this right manually is tiresome, so first check whether this can be done semi-automatically, see e.g. https://medium.com/one-weekend-at-a-time/semantic-commit-messages-and-automatic-version-tagging-in-github-actions-184a82a7a827.