The next commit implements the LCD and animation support. To enable an easy
way to create animations for it, add details in the README regarding the way
the SD card is used and how the files need to be formatted.
Create the Utils directory and add a Rust project to do the bit flipping and
a script that automates all the steps described in the README.
Add a README for Utils explaining how to use them.
Implement a set of functions to create messages following the protocols
defined in the README for communication.
Handle HID, which is used to communicate with the interactive application.
Update README with details on the message structures.
Previously, the return value when a tag was gone was the negative ID.
However, this isn't the most effective to process later as a negative
number uses two's complement, changing all lower bits in addition
to the sign bit.
Change this to just set the sign bit instead. This still produces
a negative number, which is what we want to check to konw if the tag
is new or went away, but maintains the lower bits so the ID can be
retrieved with a simple bit-wise and.
Add a new class to handle the RFID module and associated data
in order to track active tags.
Update main with RFID initialization and a minimal usage to
check it is working as expected.
pinMode most of what could be useful in the main and put modules
LOW to minimize power draw before the regulator is ON.
Add the skeleton for the setup, main loop and battery level checking.
