Libretime: Add ability to edit metadata for multiple tracks at once

[Robbt]

Is your feature request related to a problem? Please describe.
It can be difficult to manage the metadata of tracks especially in conjunction with grouping them into smartblocks by applying a specific metadata value.

Describe the solution you'd like
It would be great if we provided a way to select multiple tracks from the Library and then open up a bulk metadata edit that would allow you to override a specific field.

Describe alternatives you've considered
It could also be done through a special metadata page. In general how to build this feature needs to be fleshed out in terms of the UI and functionality.

Additional context
This has been a requested feature on the forum

[Nirei]

For some reason GitHub isn't letting me upload an image. :disappointed:

Couldn't this be implemented preserving most of the current UI as is?
Instead of the track name on the editing window title, the number of tracks would be shown. Selecting multiple tracks and clicking _Edit_ would open only one edition panel.

In this panel, all fields that have the same value in all selected tracks (either for blank or for some specific value) would be shown normally displaying that value.
Fields that do not would show a (multiple values) text in the field box of each metadata field. This would stay there unless that specific field is edited and only those fields that have been edited would actually be updated.

If the user mistakenly edits a field, they would have to _Cancel_ and start again, which shouldn't be a problem most of the time. It would also be nice to show some kind of confirmation on save including the list of changes that will be made to metadata and asking the user before applying the changes, since this has the potential to irreversibly ruin a whole lot of work.

[Robbt]

This is a good idea, thanks for the suggestion. If I have the time to implement something like this I'll use this as a starting place. There would just be a fair amount of javascript etc to code and modify to make this work and our current tech stack is very cumbersome to implement new features with.

[Nirei]

I'll make a pass at it and see what comes out as soon as I have some free time! :smile:

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