libraries/Adafruit_MotorShield: Add the Adafruit MotorShield v2 support

Signed-off-by: Jason S. McMullan <jason.mcmullan@netronome.com>
libraries/Adafruit_GFX: Add the Adafruit GFX library

Signed-off-by: Jason S. McMullan <jason.mcmullan@netronome.com>
libraries/Adafruit_ST7735: Add Adafruit ST7735 display driver

Signed-off-by: Jason S. McMullan <jason.mcmullan@netronome.com>