Review placement of fan-game VGM tracks

[towerofnix]

As Morris noted (#hsmusic-chat):

we do have fangames in there though
there's some Sonic Before/After the Sequel songs in there
and they have the Sonic franchise artist, like any other official Sonic song on the wiki

Lan:

Huh. That's a mistake, I believe, or not something I would call consistent right now. Would be good to trace.

Morris linked these tracks:
https://hsmusic.wiki/preview-en/track/before-the-sequel-title-screen/
https://hsmusic.wiki/preview-en/track/breakfast-time-for-horizon-heights-boss-act-phase-2/
https://hsmusic.wiki/preview-en/track/the-adventure-continues-for-horizon-heights-act-1/

Lan noted tracks like this (specifically unreleased Pokémon Unbound tracks) should go under "Miscellany by Homestuck Musicians" or "Other music originating outside Homestuck", in the current layout. There shouldn't be a "Sonic the Hedgehog" or "Pokémon" artist. Reasoning below:

Does include stuff by non-official discography artists, mind. I don't think we have anything from fangames in "Music from video games" yet, because everything there belongs to a franchise, and franchise artists currently only cover official material from that franchise

We need to do a more thorough look-over of all tracks in "Music from video games" to check for other tracks that are from fan-games, and update them accordingly.

Alternatively (/in addition), we can consider improved structuring for video game music in general, with fan-games in mind. Although it's reasonable that fan-tracks don't belong under a franchise artist per se, they're surely related as far as "more references to undertale stuff" go. See also #470, #412.