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

implementing XML Report generation. fetching all required input data, make airdragdata a separate component

exending input data for engine (new json format version), extending vsum output, adding input fields for additional engine parameters, adapt expected results (updated sum-files)

fix testcases: mock gearbox has to return geearinfo, measured speed / pwheel mode cope with EngineSpeedTooHigh response

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

all test-cases green.