Reconsider the use of rdf-ext for specific purposes

[jsheunis]

I have started using https://github.com/rdfjs/N3.js for some aspect within shacl-vue, including loading quads from a file and exporting the quads from an rdf.dataset to TTL. This feels intuitive, and might be even more useful for other tasks currently done by rdf-ext. The goal here is to evaluate which tool to use for which tasks and to settle on a generalised structure for applying these tools in shacl-vue.