[v3] doxygen group markup

[Benjamin Kosnik]

This is a documentation-only patch. It takes the existing doxygen
module markup, and nests the current modules into nested groups. Some
of the markup (random, cmath) is done this way already. The end goal is
to gradually grow this is in a similar way to the docbook/xml chapters,
where the doxygen module info can be linked/reused into the docbook/xml
permalinks.

tested x86_64/linux

-benjamin
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