Rationalizing the use of the various EXTEND macros.

Those macros used to handle in a special way the grammar entries and generic
arguments known statically from Coq, i.e. defined before Pcoq. This was hardly
predictible and very implementation-dependent.

We made the EXTEND macros much more light-weight by treating in a uniform way
all entries and arguments. Now, they are all produced by outputing the name
as-is for entries and as "wit_$name" for genargs, thus letting the scope
of the ML code decide which entrie is going to be taken. This is documented
in the dev/ changelog.

This also allows to get rid of a lot of dependencies in the grammar preprocessor,
reducing it to a small functional shell. It is still depending on Compat, but it
is most probably possible to reduce the code size even more.

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