NextGen Scania P, G, R, S FMod & Open Window v2.3

Changelog v2.3
– 1.39 support
– Implementation of drivetrin revision by galimim
– New V8 engines including 770 hp
– Small fixes and stuff i already forgot

– Version 1.39.1
– Author: Eugene
– Support DLC: Cabin Accessories
– Support DLC: HS-Schoch Tuning Pack
– Support DLC: Window Flags
– Support: Openable windows
– Support: FMOD sound system