Oxigraph

This release replaces rdflib.js with oxigraph to improve speed and reliability. Oxigraph is a more vanilla library.

Main drawback is that Oxigraph doesn't support interrogating the store for namespace prefixes. This means that we're using the https://prefix.cc list to populate prefixes in the visualization. We plan to be a bit more intelligent about this and bring back a more robust namespace-prefix management.

The VSCE package is getting quite big, and we're looking into making it smaller and more compact. The current version is not minified due to an older version of @digitalbazaar/http-server somewhere in the dependency-chain. This library uses another dependency that has a top-level await, which is not supported by esbuild (our minifier of choice). Stay tuned.