TrackSafetyDigitalEX rev D.4

D.4
add support for DSF version 2

D.4.1
add support for 15-button hand controller
additional event logging into audit files
add alpha to car numbers, i.e 22X, 4A. etc.

D.4.2
additional event logging into audit files
add function to configure individual hand controllers

D.4.3
add turn description entry for enhanced audit logging
add flag description entry for enhanced audit logging

D.4.4
fix embedded carriage return in turn and flag descriptions

D.4.5
enhanced brightness level control