Use the [`footnotehyper`](https://ctan.org/pkg/footnotehyper/) package if available.
This is a rewrite of `footnote` that is compatible with `hyperref` and `babel-frenchb`.
This patch also addresses the incompatibility with `xcolor` noted in #4861, but the
new package has only been available since 2016, so this template still loads `xcolor`
earlier for compatibility with older distributions. Note that the `footnote` package
is part of `collection-latexrecommended` in TeX Live, so there shouldn't be any
problem loading it unconditionally as we now do if `footnotehyper` is not available.
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