Support artist tag

[lyaaz]

Is your feature request related to a problem? Please describe. I have lots of pictures downloaded from the internet, which have artist tags, but Aves can't display these tags or search by artist yet.

Describe the solution you'd like Allow display artist tag just like other tags, and also can search or modify.

Additional context I have found two related exif tags: Artist and XPAuthor

[deckerst]

Similar to other minor tags, like the model, I don't intend to include them like I do for the major ones. Reasons here:

• #424

That said, I'd like to find a way to let users add custom tags of interest for the app to scan and register.