Radio Enhancements 1.3.0

Changelog 1.3.0.0
- A preferred start station can now be set
- Radio stations are now saved per vehicle; the preferred station only applies to vehicles without a saved station
- Vehicles and speakers now keep their own station; outside the vehicle, you will always hear the station of the nearest active vehicle
- Mod settings can now be changed directly in the in-game menu under General Settings
- Helper radio volume is now reduced to 50% by default and can be adjusted freely
- The radioEnhancementsVehicles.xml in the savegame now also stores the manufacturer, type, and station of the vehicles