Punctuation moving mechanism

[denismaier]

I've brought up this issue a while ago on the pandoc-citeproc issue tracker: While the punctuation moving mechanism is quite nice, it's also not sufficient in some situations. To deal with this I've built a lua filter that essentially works in the opposite direction. Instead of moving punctuation inside the quotes from after the citation, it extracts the punctuation from the quotation and moves it after the citation.

Would it be possible to include such a feature here, or is that out of scope?