Dear Ihor,

thank's for your advice! Here is the updated patch. Now it works.

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ox-latex: New option to customize LaTeX footnote command

Some LaTeX classes define their own footnote commands. For example,
kaobook
(https://github.com/fmarotta/kaobook/blob/master/example_and_documentation.pdf)
has \footnotes and \sidenotes, whereby sidenotes (notes are put into the
outter margin) are the dominant form of putting notes in kaobook. It
would be great if you could make the footnote command in the footnote
function customizable. My proposal is in the attachment.
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