Create a robotics reference design

[mwelling]

Create a modular robotics reference design.

Make sure that different sensors, motors, actuators, audio/visual/tactile feedback modules can easily be swapped in.

PWMs module for servo control
Stepper motor controller module
DC motor controller module
Camera module for machine vision
Screen module for visual feedback
LED matrix module
IMU module
GPS module
Lidar module
Temperature and atmospheric sensor modules