Spitfire theme music

This changes the Spitfire wallpaper music to the pre-release trailer. (JSGME ready)
https://www.youtube.com/watch?v=xFS6DmZuOHw

This changes the Spitfire wallpaper music to the pre-release trailer. (JSGME ready)

Instructions for manual installation:

To save a backup of the old wallpaper music:
1. Go to DCS World/Mods/aircraft/SpitfireLFMkIX/Sounds/
2. Make a backup of the EditorMusic folder

To install the alternate theme music:
1. Open the folder "Spitfire Theme Music"
2. Inside you will see the folder "Mods." Copy this into your "DCS World" folder.
3. It will ask if you want to overwrite. Do so.