* In Options.HTMLMathMethod, the KaTeX contsructor now takes only
one string (for the KaTeX base URL), rather than two [API change].
* The default URL has been updated to the latest version.
* The autoload script is now loaded by default.
This will ensure that we only need to update these in one place.
(Currently, for example, the mathjax URL is used in both
App and trypandoc.)
Closes#3685.
* Renaming Text.Pandoc.Class.warn to addWarning avoids conflict
with Text.Pandoc.Shared.warn.
* Removed writeRTFWithEmbeddedImages from Text.Pandoc.Writers.RTF.
This is no longer needed; we automatically handle embedded images
using the PandocM functions. [API change]
* Remove exported module `Text.Pandoc.Readers.TeXMath`
* Add exported module `Text.Pandoc.Writers.Math`
* The function `texMathToInlines` now lives in `Text.Pandoc.Writers.Math`
* Export helper function `convertMath` from `Text.Pandoc.Writers.Math`
* Use these functions in all writers that do math conversion.
This ensures that warnings will always be issued for failed
math conversions.
