Ytdl-sub

[BUGFIX] Do not set music_directory in prebuilt presets (783)

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

[BUGFIX] Have `__preset__` override nested preset keys (784)

With the new preset nesting support, `__preset__` would have lower precedence which isn't ideal since it's meant to serve as a 'apply to all presets in this file'. Now the order of priority is:

`inherited presets (top-to-bottom) -> preset itself -> nested subscription presets -> __preset__ -> subscription values`

[BUGFIX] Write music multi-tags correctly (782)

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.

[FEATURE] Prebuilt music presets (780)

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

[DOCKER] Remove default gui settings (776)

[DOCKER] Move cont-init.d files (775)