Rework Vanilla Sounds v 1.0

Initial project to expand the vanilla sound from Amtrucks & Eurotrucks.
Sounds already improved/or added:
-ISX15/X15 Stock. -CAT C15. -Paccar MX-13. -Volvo D13
Plans for the next updates are:
-Add Navistar engine. -Add Detroit DD13-15 engine.
Credits:
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