[feature request] YAML shortcut for endfloat

[dhicks]

Many academic journals in, eg, psychology require placing figures and tables at the end of the manuscript for review. I use the endfloat package to do this, as so:

header-includes:
    - \usepackage{endfloat}

But I'm not a psychologist, and only very occasionally publish in journals that require moving the figures and tables around. So every time I have to mess around with a bunch of web searches until I find the magic combination of keywords that reminds me of endfloat.

So it would be nice to have a shortcut option, included in the Quarto docs, that might look like this:

endfloat: true

If the output format is PDF, this would simply include \usepackage{endfloat} in the header. And otherwise it would be ignored.

[cscheid]

This seems like a good use-case for a quarto extension. See https://github.com/quarto-ext/ for the ones we've created ourselves in case you want to give it a shot, or give the extension docs a read: https://quarto.org/docs/extensions/.

The design I'd go with would likely be a Lua filter that checks if quarto is rendering to LaTeX, and calls the API to register a header-includes block. (We might add this ourselves in the next couple of weeks - but I don't have time atm)