Add comment with pin configuration of Paulie bot
Remove unused variables sensor_*_pin
Configure pins for Paulie bot
Behavior: Divide in multiple files, change interface, go forward by default
Cosmetic: Reorder sensor pins in setup()
Introduce *_black variables that abstract from pin input interface
Fix time used throughout a main loop iteration

Introduce variable time.
Introduce diods

Diods show the current follow mode.
Introduce WAIT mode

Robot waits for a button press when the program starts.