Changelog for Version 5.5:
multiple variations of the engine start and stop sounds (depending on compressor on/off, opticruise gearbox/manual gearbox)
slightly reworked compressor sound
small changes in the load/exhaust soundtracks
new turbo sound
new engine brake sound
new blinker sound behaviour
new sounds for applying/disengaging the parking brake
new parking brake apply warning
new manual gearbox + clutch sounds
