ETS2 - Realistic Rain V3.8.1 (1.40.x)

Changelog v3.8.1 for 1.40:
- Some small changes in the behavior of the raindrops:
- The appearance of drops on the glass depending on the speed of the truck is now more realistic
- Slightly increased the appearance of drops on the windshield (but they will also disappear sooner when there is no rain)
- Better opacity of the raindrops
- Texture water particles/spray has been changed
- Some textures and parameters/values have been adapted to the new 1.40 lighting
- The sound of the rain falling in the cabin has been changed

Authors: Author: Darkcaptain
Thanks for support & feedback: Antoniopua, Stropher, JBX, silberfuchs
Thanks for the help with FMOD Tool: Robinicus
Thanks for the help in previous versions: Cip, Frkn64, AlexeyP