Implement demo potentiometer driving LED graph and variable colors.
Move the switch statement to determine pins for the LED graphinto an array lookup.
Refactoring LED Meter class
Configure clear() method to hit actual configured anodes, not entire row.
Refactoring LEDMeter
Add rule for 'undefined' button
Correct class name for rules
Refactor switch expander logic into its own class
Introduce scanPots function to wrap scanning of potiometers