Working version without LEDs

Dependencies:   mbed WS2812

Voici le dernier schéma de cablage (version du 08/02/2020)

https://os.mbed.com/media/uploads/max_ence/schemarobot_fev2020.pdf

LED_WS2812/Pixel/PixelArray.cpp/shortlog@0e577ce96b2f: not found in manifest