Require certain fields on file upload

[BobJonkman]

Is your feature request related to a problem? Please describe.

When uploading a music track (Track Type=MUS) we require the "Title", "Artist", and "Genre" fields to be filled in. When uploading a pre-recorded show (Track Type=PRS) we also require "Album" for the show name, but don't need "Genre". There are similar requirements for other track types, eg. Interview, StationID, PSA, &c.

Describe the solution you'd like

To achieve this, I would like that before a file is uploaded, rthe "Track Type" selector must be selected (ie. no Track Type pre-selected), so that uploaders must choose Track Type every time they upload a new set of files. In settings, there would be a UI to associate required ID3 attributes for each Track Type (maybe a full table of checkboxes for Track Type by ID3 attribute, maybe a Track Type selector which shows a list of ID3 attributes with a checkbox for each). After a set of files is uploaded, if the required ID3 attributes are missing from an uploaded file it gets displayed in the usual track edit window with an error message and the appropriate missing ID3 field highlighted.

Describe alternatives you've considered

Right now we're depending on training and documentation to achieve this. But our stations is all volunteer, and compliance is low, leaving it to the Digital Librarian (me!) to go back and fix all the uploaded tracks.

Additional context
Add any other context or screenshots about the feature request here.

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