Add filename template to plugin settings

[jamesvclements]

Something like this:

Perhaps at least exposing the title and author, or maybe all the same variables available in the note template

[anvimea]

Seconding - I requested something like this earlier and it was rerouted to other template developments.

Still waiting for this function, unless I'm mistaken and nunjucks can interface with file-names?

[hunterclarke]

I find filenames to be particularly tricky because they are one of the ways we double check state for a particular article. That being said, I agree this would be nice to have! I just couldn't fit it into the broader template work.

Happy to review any PRs. Otherwise, I'll look at taking this on in the next batch of changes.

[anvimea]

Would be totally fine if it only worked when double-checking was disabled, TBH!