Make all calls to getMillisSinceEpoch uniform on return type
incremental get rid of currentTimestamp in sector timing.
Convert lastSectorTimestamp to millis timestamp and do tests
Convert lastLapTime and friends to millis
Move predictive timer to epoch based times
Remove secondsSinceMidnight and friends entirely

Replaced with use of Epoch and conversion from millis to minutes/seconds
where appropriate.  Also updated LUA function to return seconds since
Jan 1 since this is most appropriate for the limits of float.  Also got
rid of two useless lua methods since now everything is in seconds and
we don't need time diffs provided by getTimeDiff and getTimeSince.