Add support for parsing reified triples and triple terms

[rubensworks]

This removes RDF-star parsing and instead implements for triple terms and reified triples from RDF 1.2.
I just wanted to raise this PR already to avoid duplicate efforts.

Note that some spec tests fail, because not all of them have been updated yet: w3c/rdf-tests#161

Also note that this PR does not update the writer yet.

This PR builds on top of #484 and should only be merged after w3c/rdf-star-wg#141 is resolved.

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[jeswr]

This removes RDF-star parsing and instead implements for triple terms

Note this repo now uses semantic release, and this is a breaking change. Make sure to include BREAKING CHANGE in the commit title and body when squash-merging this work into the main brach.

[RubenVerborgh]

this is a breaking change

Fingers crossed that the RDF WG sees it that way indeed 😉

Excellent work, @rubensworks.

[rubensworks]

@RubenVerborgh FYI, this now includes parsing of the new version directive (w3c/rdf-star-wg#141).
I wouldn't recommend merging yet though, as it's still being incorporated into the specs atm.

[rubensworks]

@RubenVerborgh The new VERSION directive seems to be quite stable now across all specs.
How do you prefer going forward with this one?

We could merge and release as soon as the specs either go to CR or Rec status.
Or we could already merge now, and publish a prerelease.
(The latter option as first step would make Comunica dev around SPARQL 1.2 a lot easier)
Given the removed (=modified) RDF-star support, this should be a major version bump IMO.

[RubenVerborgh]

@rubensworks All good, thanks a lot. This has been an impactful pull request.

Minor comments. Open question whether we also want to check (in the future) whether certain constructs are indeed version-allowed, like direction.

I'll leave the further handling to you, you can merge and publish as desired.

[rubensworks]

Thanks for the review @RubenVerborgh.
After processing the comments, I will publish a prerelease asap (without merging to master for now).
Once the RDF specs go to CR or Rec, I will merge to master and do an actual release.

[rubensworks]

For reference, the contents of this branch are now published as 2.0.0-beta.1 under the next tag.

[RubenVerborgh]

All good, comments were minor; do proceed.