Call for testers: Tag based IDs behind the scenes

[NattyNarwhal]

I'd like for people to test GH-177; a download link to a compiled version is provided in the first comment there.

While it isn't exactly exciting user-visible features, it should hopefully long-term resolve a lot of wonkiness when using Submariner with a lot of server implementations, by reducing the data model vs. API mismatch. As such, I want to hear feedback regarding this.

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Why does it matter? Because Submariner's internal data model is in term of artists, albums, and tracks, in a strict fashion. However, it made API requests that worked against Subsonic's directory based API. Because of this, it had to reconcile the output of that API with its own data model. Later, Subsonic added an artist-album-track based API that actually matches Submariner's internal model of the world, but Submariner was originally developed before that API became available. I'm finally able to correct this mismatch, ~15 years later.

[NattyNarwhal]

I'm doing this in 3.0.