citeproc-rs is no longer maintained, and people who had enabled the
hidden pref were hitting errors.
This also drops the free() call on CSL engines, which only existed to
free the citeproc-rs wasm driver.
https://forums.zotero.org/discussion/133515/
EDTF dates -- ranges ("2021/2026"), uncertain/approximate dates
("2004-06~"), and BCE dates ("-0429") -- and common equivalent notations
("1995-1996", "2021-22", "~1995", "ca. 1995", "429 BCE") are now passed
to citeproc-js as CSL date ranges, circa flags, and negative years.
Previously, such dates were mangled or dropped entirely unless entered as
CSL variables in Extra.
CSL date variables in Extra get the same parsing.
Other date handling in the client doesn't understand EDTF yet: the y/m/d
indicator in the date field doesn't reflect EDTF parsing, date searches
only match a range by its start date, and BCE dates still can't be
sorted.
Addresses #637
Accented stop-words weren't matched by the existing unaccented
entries (e.g., "fur"), so automatic journal abbreviation kept and
capitalized them: "Jahrbuch für Heimatkunde" became "Jahrb. Für
Heimatkunde" instead of "Jahrb. Heimatkunde".
https://groups.google.com/g/zotero-dev/c/uP18QEKe2JU/m/AsoGWxd9AwAJ
The CSL locales repository replaced locales-sr-RS.xml with script
variants, so citing with a stored or default 'sr-RS' locale loaded no
terms and failed with an et-al error. Resolve unavailable locales to
the closest available CSL locale (sr-Cyrl-RS for sr-RS) when rendering
and in locale selectors.
https://forums.zotero.org/discussion/comment/515598/#Comment_515598
