Make PcmUmlClassTests View-Based

[h4uges]

Get rid of tests that are based on LegacyPcmUmlClassApplicationTest and use instead PcmUmlClassApplicationTest which is a ViewBasedVitruvApplicationTest

• Open: Adapt UuidResolverImpl to handle Primitive Types correctly (needs own PR)

[TomWerm]

Thank you very much for your contribution. I added some minor comments which we should discuss. For this PR to be merged, I think we have to first fix the primitive type issues. I will try to free some time to work on that.

[h4uges]

Some test cases only work with a adaption of the UuidResolverImpl, to handle Primitive Types. Which has to be done in a separate PR.
It is not clear which influences this changes has to other test projects and use cases.

Adaption in the UuidResolverImpl:

private Uuid getUuidForReadOnlyEObject(EObject eObject) {
		String relativePath = EcoreUtil.getRelativeURIFragmentPath(eObject.eResource().getContents().get(0), eObject);
		
		if(relativePath.equals("")) {
			return new Uuid(URI.createURI(eObject.eResource().getURI().toString()).toString());
		}
		
		return new Uuid(URI.createURI(eObject.eResource().getURI() + "#//" + relativePath).toString());
}

The ObjectResolutionUtil.getHierarchicUriFragment could be useful to develop a more general solution for this problem.