Split Core & Proto & RDF etc.

[vorburger]

I'm starting to think that I may eventually do a major refactoring wherein Enola's "Things Core" would be more completely separated from Proto & RDF (et al.), which would become "plugins". It might one day look something like the following, which is a fairly different package structure from how things look like as I'm initially writing this:

• dev.enola.common.io
• dev.enola.core.datatype
• dev.enola.core.thing
• dev.enola.format.rdf
• dev.enola.format.proto
• dev.enola.model.markdown
• dev.enola.model.java
• dev.enola.shell.repl
• dev.enola.cli
• dev.enola.web
• dev.enola.ai

It's a bit premature for this as-is today, as more will need to be untangled in the code, but creating this issue to track possible future related work.

What a "plugin" approach means for the CLI & distro is TBD. (💀 OSGi! 🤣 https://github.com/vorburger/HoTea?)