motion_picture titles not italicised, nor moved outside parentheses

[njbart]

pandoc-citeproc does not render motion_picture titles as expected:

1. titles are enclosed in double quotes instead of being italicised (though the CSL file clearly instructs the processor to do the latter, see https://github.com/citation-style-language/styles/blob/master/chicago-author-date.csl#L197). This happens both in the in-text citation and the reference list entry.
2. Where the movie’s name appears in the text, it should appear before/outside of the parenthetical citation (containing the year only in such cases) – but it appears inside the parentheses.

Example (csl file is a patched chicago-author-date.csl which includes director as secondary-contributor, pull request submitted; but the original chicago-author-date.csl shows both issues as well, as does chicago-fullnote-bibliography.csl):

pandoc -F pandoc-citeproc -t markdown-citations << EOT

# Text

@nbn is a spy thriller film.

@item1 is a book, for comparison.

# References

---
csl: https://github.com/citation-style-language/styles/raw/ae2167dcb86db405b65915d2be591cf764a808b5/chicago-author-date.csl
references:
- type: motion_picture
  id: nbn
  title: North by Northwest
  director:
    family: Hitchcock
    given: Alfred
  issued:
    year: 1959
  publisher: Metro-Goldwyn-Mayer
  publisher-place: USA
  language: en-US

- title: Book title
  id: item1
  issued:
    year: 2013
  author:
    given: Al
    family: Author
  publisher: Publisher
  type: book
...
EOT

Expected output:

Text
====

*North by Northwest* (1959) is a spy thriller film.

Author (2013) is a book, for comparison.

<div class="references">

References {#references .unnumbered}
==========

<div id="ref-item1">

Author, Al. 2013. *Book Title*. Publisher.

</div>

<div id="ref-nbn">

*North by Northwest.* 1959. Directed by Alfred Hitchcock. USA:
Metro-Goldwyn-Mayer.

</div>

</div>

Actual output:

Text
====

(“North by Northwest” 1959) is a spy thriller film.

Author (2013) is a book, for comparison.

<div class="references">

References {#references .unnumbered}
==========

<div id="ref-item1">

Author, Al. 2013. *Book Title*. Publisher.

</div>

<div id="ref-nbn">

“North by Northwest.” 1959. Directed by Alfred Hitchcock. USA:
Metro-Goldwyn-Mayer.

</div>

</div>

[jgm]

I've confirmed that this has to do with the nonstandard Show instance in Reference.hs lines 245ff.
Shouldn't be too hard to fix.

[jgm]

OK, I'm about to push a fix for the improper treatment of the title (quoted rather than emphasized).

The other issue is a separate one. Since there is no author here, an AuthorInText citation behaves just like a normal one. We might consider modifying the behavior of AuthorInText citations (and renaming to something like InTextCitation), but that's a bigger change, with ramifications for any kind of item that lacks an author. So I suggest making a separate issue for that, and maybe discussing first on pandoc-discuss.