Music multi-tags (artists, albumartists, etc) were not writing correctly. Fix it by explicitly checking to see if the tag is multi or not in the codebase.
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