Merge main/cosv and main/udm into main/autodoc.

main/autodoc depends on main/cosv and main/udm.
main/udm depends on main/cosv.
No other module depends on main/cosv or main/udm.
T

Merge main/cosv and main/udm into main/autodoc.

main/autodoc depends on main/cosv and main/udm.
main/udm depends on main/cosv.
No other module depends on main/cosv or main/udm.
The only deliverable from main/autodoc is the autodoc executable -
there are no libraries, and all headers remain private and undelivered.

We might even be able to use some third-party documentation generator
instead of autodoc, perhaps Doxygen. Whether we should go that way is debatable,
but there is no point in littering main/ with 2 modules and littering solver/
with many headers and 2 static libraries just so autodoc can consume them.
Rather make their code internal to autodoc.

Patch by: me

(cherry picked from commit 11c03c6d381fea19f0fea13ae5a371ba50bad241)

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