Kinds as rdfs:subClassOf

Instances of `kind_of_X` are new entity types, so as well as being `rdf:type kind_of_X` they should also be `rdfs:subClassOf X`.

E.g. for an instance of `kind_of_organization` the triples should be:

```
ex:1 rdf:type hqdm:kind_of_organization.
ex:1 rdfs:subClassOf hqdm:organization.
ex:1 hqdm:data_EntityName "National Government". # optional entity name
```

The `ClassServices.createKindOfX()` methods should add the `rdfs:subClassOf X` predicate.
Also, any entity that is a `member_of_kind` of, for example, `ex:1` above, should also be `rdf:type ex:1`†

E.g.:

```
ex:2 hqdm:member_of_kind ex:1.
ex:2 rdf:type ex:1.
```

This allows standard RDFS entailments to infer that:

1. `ex:1` is an `rdfs:class`
2. `ex:1` is of type `hqdm:kind_of_organization` and all its supertypes.
3. `ex:2` is of type `organization` and all of its supertypes.
4. When read from a triple store by MagmaCore, `ex:2` will implement the `Organization` interface and all of its super interfaces so `instanceof Organization` will be `true` and it can be cast to that type rather than simply being a `Thing`.

† I'm not sure how we enforce this, so some additional changes might need to be included to enforce this constraint, if it is even possible to do that.