remove separation of full-load curve into gbx fld and engine full-load curve; only use engine-full-load curve (refactor reader)

major refactoring: use multiple full-load curves, one per gear. introduce vehicle-defined limits and gearbox-defined limits

all test-cases green.

adding estimated axle losses (via databus), change gearbox losses to use value from previous state, refactoring of coastingdistance computation (renaming variables)