Creates standardized prebuilt presets for music videos. Preset names are:
```
"Kodi Music Videos"
"Jellyfin Music Videos"
"Plex Music Videos"
```
Usage can be found in the `examples/` directory
For music presets, adds `track_genre_default` as an override variable (defaults to Unset)
For TV show presets, adds `tv_show_genre_default` and `tv_show_content_rating_default`, which default to 'ytdl-sub' and 'TV-14'
New music prebuilt presets had set `music_directory`, which is bad practice since it's not visible to the user which directory it would use. This forces `music_directory` to be set either in the user's config or subscription file
Adds the following prebuilt presets:
```
"Single"
"SoundCloud Discography"
"YouTube Releases"
"YouTube Full Albums"
"Bandcamp"
```
which require no config.yaml to use. Usage examples can be found in the `/examples` directory
