Notations: Adding modifiers to tell which kind of binder a constr can parse.

Concretely, we provide "constr as ident", "constr as strict pattern"
and "constr as pattern".

This tells to parse a binder as a constr, restricting to only ident or
to only a strict pattern, or to a pattern which can also be an ident.

The "strict pattern" modifier allows to restrict the use of patterns
in printing rules. This allows e.g. to select the appropriate rule for
printing between {x|P} and {'pat|P}.

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