Main menu music tracks now set to be loopable, just like how it was in the pre-FMOD era of the game

Repacked with newer version of the Game Archive Packer for more efficient loading.
Reduced file size of the mod image in the Mod Manager.

Added Bus Driver theme music as a main menu track

Rework of mod:
- New soundtracks (including original themes from 18 Wheels of Steel & German Truck Simulator).
- Updated mod title, description and images.
- Fixed the issue where the music would stop after customizing your truck for a long time.

Added optional mod support for Convoy mode

Updated mod icon and description

- Added an extended version of the former truck upgrade music from pre-2014 ETS2.
- Reduced file size.

Fixed issue where music was not looping

Added 1 more classic ETS2 menu music track

Updated for FMOD sound engine. Added 3 menu music tracks from Euro Truck Simulator 2