Another communication with my car, via standard codes and modes

The application now can:
- clear DTC codes
- produce monitor status report
- ask for engine load in percents
- ask for fuel trims
- ask for intake air temperature
- ask for engine coolant temperature
- ask for distance with MIL and since codes cleared
- ask for fuel level input

Ok, now I should do more unit tests instead of integration and also I should
use application directly, not through those tests :)