FEATURE: Split Timing

[TheAngryRaven]

Problem

Currently only has the ability to monitor a single "start stop" line

Description

It would be much nicer if we could actually have the ability to monitor lap split times so that we can notify the driver when they have completed a "purple" sector, or display an "optimal time"

Proposed Solution

void addSplitLine(double pointALat, double pointALng, double pointBLat, double pointBLng);
int getSectorCount();
unsigned long getSectorBestTime(int sectorNumber);
unsigned long getSectorPaceDifference(int sectorNumber);
unsigned long getSectorPaceDifference(int sectorNumber);
unsigned long getOptimalLapTime();

This will probably require great re-work to ::loop and ::checkStartFinish, this code isn't exactly portable in its current state, and the original intention for the loop was not a great one.

It would probably make better sense to do something like:

1. check last line passed
2. save current sector to variable
3. Using current sector information, prepare looking for NEXT LINE ONLY
   a. Or the start-line if race not started

It would be the responsibility of the consuming application to alert the driver on a purple sector.

Concerns

The actual hard part is going to be figuring out a way to manage the individual split stats (odometer/time/etc) for calculations.
The way we are currently handling the start-finish times alone is a bit gross.