Simplifying and uniformizing the implementation of tactic notations.

This branch mainly provides two features:

1. The resolution of tactic notation scopes is not tied to a hardwired Pcoq
registration anymore. We expose instead an API to interpret names as a given
generic argument, effectively reversing the logical dependency between parsing
entries and generic arguments.

2. ML tactics do not declare their own notation system anymore. They rely instead
on plain tactic notations, except for a little hack due to the way we currently
interpret toplevel values.

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