add LastLapFuel property to store fuel load at the end of the previous lap.
added StartedLap event handler.
added LapsRemaining property.
Add UI elements for fuel info.

- fuel remaining
- laps remaining
- target fuel usage
- previous lap fuel usage
removed "laps remaining" and increased font size.
change fuelTarget calculation to plan for 1.0 left in the tank.

In F1 2013, the car slows down when the fuel value is less than 1.
Merge pull request #4 from trv/fuelData

Fuel data