Baseline for v8

- Improved delta time accuracy, now using UpdateTelemetry() too,
  for 100 hz updates, potentially. It still uses vehicle velocity
  to estimate position and speed, so it's not 100% but quite close

- Improved accuracy caused a problem when wanting to update the
  delta best time on screen. We can't be too fast to update or
  the visual result would be a mess! After many trial and error
  cycles, I landed on an approach that's similar to what iRacing
  is doing. I watched this video for inspiration:

  http://www.youtube.com/watch?v=gCine-Qff0k

  I tried to make the visual updates accelerate if the difference
  between the previous delta time value and the one to be displayed
  is greater. The visual effect is nice and still easy to read.