Radio Enhancements

This script adds some useful enhancements to the in-game radio.

1. You can now change the radio volume in vehicles at any time without opening the menu.
Default keys:
- Left Shift + 4 quieter
- Left Shift + 6 louder

The keys can be changed in the menu settings.

2. The current radio volume is shown for a short time in the F1 menu and then disappears again.

3. If you leave a vehicle while a radio station is switched on, you can continue to hear the radio up to a certain distance.
- after leaving the vehicle, the volume is reduced to 20% of the current value (can be changed)
- if you move away from the vehicle, the music becomes quieter and quieter (maximum distance can be changed)
- if you move closer again, the volume slowly increases again
- the radio must be switched off manually in the vehicle to disable this function
- the radio state (on/off) is saved individually for each vehicle
- helpers switch the radio on by default - you can hear it when driving past :) (helper radio can be disabled / changed)
- a RadioEnhancements.xml file is created in the modSettings folder where you can change values

4. Multiplayer
- the script synchronizes the radio state (on/off) and the volume of your multiplayer vehicles
- if another player drives past you with the radio switched on, you will hear it too
- internet radio streams are synchronized with your multiplayer partners if you have also set them globally on your side

5. Partybox (Changelog 1.2.0.0)
- you can buy a portable speaker in the shop under Miscellaneous > Miscellaneous
- this Partybox can be carried anywhere and, if desired, continuously plays your radio stations / music everywhere
- to use it, simply "enter" the speaker and check the F1 menu
- the Partybox has its own volume control, independent of everything else
- animated party lights of the speaker can be enabled in the F1 menu and are multiplayer compatible