First use of “development” branch

RGB Light Control is now complete — next step is convert to optional
library

This change recomputes the storage location for RGB data when an <E>
command is issued to store sensor, turnout, and output definitions.  It
also writes the current RGB color to EEPROM, even if it has not been
previously written.

Adds AutoTimer library using OCRA of Timer 4.  TBD:  SEE IF WE CAN MOVE
THIS TO TIMER 2 AND SCALE COUNTDOWN SO THAT DEFAULT SETTING OF TIMER 2
DO NOT NEED TO BE CHANGED

Now uses Timer 2 with no modifications.  Good for both Uno and Mega

No longer needed

Green=pin 44, Red=pin 45, Blue=pin 46

Must add in EEPROM saving and any logic to enable/disable autopilot
from DCC++ Controller

Tested interaction between AutoPilot and Controller.   Once AutoPilot
has started (e.g. cab lights are being cycled), starting up Controller
results in AutoPilot light showing “SINGLE_CAB_RUN.”  Turning off
AutoPilot from Controller stops program and HALTS currently running
train.  Input button and AutoPilot is then disabled for remained of
session.