require acceleration curve to be valid (case then .vacc file is not valid is handled in the cach-block

surround opening files with try/catch; separate writing files to dedicated writer class, access values via inputdata interfaces

fix: cycle gearbox: torque converter was called with wrong speed & torque; disengage if engine speed is below idle speed

removed 'skip gears' and 'early upshift' from input data and component data. only depends on shift stragety.

more clear implementation of wheels class (confusion about dynamic tyre radius and wheel diameter), extending testcase