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pchampin 
Introduce trait TTerm

This is a big refactoring with deep implications.
Here is a summary of what it includes:

* A new crate was introduced: `sophia_api`,
  which currently contains

  - the new trait `TTerm` and its associated types and functions,
  - the `term::matcher` module (moved from `sophia_term`),
  - the `ns module` (moved from `sophia_term`).

  In the future it will contain all core traits
  (Triple, Graph, TripleStream, TripleParser, TripleSerializer,
  and their quad counterpart).

* The new trait `TTerm` generalizes over the generic type `Term<TD>`.
  `Term<TD> where TD: TermData` was replaced with `T where T: TTerm`
  basically everywhere in the API.
  `Term<TD>` is now just one implementation of `TTerm` among others.
  Note that all its "subtypes" (`Iri<TD>`, `Literal<TD>`...)
  also implement `TTerm`,
  and can therefore be used directly in many places,
  without requiring a conversion to `Term<TD>`.

* The types implementing `TermMatcher` (and GraphNameMatcher)
   have slightly changed;
   in particular, closures used as matcher must now

  - take `&dyn TTerm` as their parameter
    (or `Option<&dyn Term>` for `GraphNameMatcher`), and
  - be enclosed in a 1-sized array
    (this is required to avoid conflicting impls of `TermMatcher`).

* The ns module now returns `SimpleIri`;
  this type is roughly equivalent to `Iri<&str>`
  and can be converted to and from `Iri<&str>` and `RefTerm`
  with From/Into.

* Native type to `Literal<TD>` conversions are moved in a module
  `sophia_term::literal::convert`;
  `AsLiteral::as_literal` now returns `NativeLiteral`,
  which is smaller than `Literal<TD>`
  and can be converted to and from `Literal<TD>`
  and `Term<TD>` width From/Into.

* `RefTerm` no longer implements `From<&str>` to produce literals;
  `AsLiteral::as_literal` should be used instead
  (combined with `.into()` if a `RefTerm` is really needed).

* Add feature `all_tests` to the `sophia` crate.

  - A number of tests are now hi... (continued)

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