[1.19] Subfolder scanning

[keatit71]

Detailed description of the feature

I like the fact i can add music from scanning a folder on my system but would it be possible for it to scan subfolders so i could just point it to a folder with all my music in folders and have it load everything rather than adding each folder separately

Verify feature request

• [X] I have checked that this is not a duplicate feature request and the feature does not yet exist in the latest version