Processing of multi-line footnotes fails with pandoc option --wrap preserve

[aoles]

Hi @yihui,
just noticed the following: footnotes spreading across lines fail to be converted to sidenotes when the line wrapping is kept with pandoc option --wrap preserve. This is because the regex in parse_footnotes does not account for such scenario.

---
output: 
  tufte::tufte_html:
    pandoc_args: ["--wrap", "preserve"]
---

Test ^[foot
note]

[github-actions]

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