Add support for GPIO input/output

[tictacmenthe]

Specifically, we have to be able to read at least 1 GPIO (Image of Raspberry PI GPIOs)

It would be best if we had a generic code that could use any GPIOs.

We musn't use the GPIOs associated with the SPI interface (used for CAN) : MOSI/MISO/SCLK/CE.
These are GPIOs 8, 9, 10, 11 and 25.

For instance, we could use GPIO 16 for the Start of Match input.

This would be useful for a control interface of the robot.

[tictacmenthe]

Add a condition for simulation or when running outside of the PI, since the GPIO libraries aren't available/functionnal that way.

[tictacmenthe]

Maybe have a script that launches/starts the main script when the start condition occurs.
Also can kill and restart it, select color or other parameters depending on buttons/switches.