Add more selectors to build_combiner_playlists

[a-rich]

Is your feature request related to a problem? Please describe.
There are multiple attributes of tracks that ought to be selectable when using build_combiner_playlists.

Describe the solution you'd like
Add implicit support for year in the numerical selector syntax [].
Since these values have non-overlapping ranges, they can be expressed implicitly:

• rating: 0-5
• BPM: 6-999
• year: >999

Generalize the {} notation as "string selectors". Support globbing. Add explicit support for:

• playlists
• label
• artist
• date added
• comments
• key

Examples:

• {playlist:* Bass}
• {artist:eprom}
• {comment:*ratchet*}
• {date:>=2022}
• {date:<2020-02-20}

[a-rich]

This is included in the releases/2.7.0 branch and the latest beta release.