[Feature Request] Relative playlist export

[invpt]

Description

It is useful to export playlists with relative paths, but playlists exported by Symphony always use absolute paths.

Solution

Keep the default behavior of exporting with absolute paths, but provide an option in the settings (or at the time of export) to use relative paths.

Alternatives

An alternative is to change the default behavior to use relative paths by default, probably still with an option to switch back to absolute paths. Most music players support both, so I assume some people prefer absolute paths.

Additional Context

I am happy and able to implement this myself and submit a PR, I just need input on your preference for how the behavior should be controlled: a global setting, or a popup at the time of export?

Checklist

• [x] I have read the Contribution Guidelines.

[zyrouge]

If you are going to PR, changing it in popup would be better.