refactor: nominal and determiner word types

[hippietrail]

As per #730 this is the first step, moving the current "noun" types, which actually combine nouns and pronouns, into "nominal" types, that being the umbrella term in grammar/linguistics that encompasses both nouns and pronouns.

Because of the use of templates to derive type and function names from other type names, I had to rename a lot more identifiers than expected.

The next step will be to move pronouns out into their own type, with a "person" (1st/2nd/3rd) property but without a "proper" property.

Then noun can also be moved out, keeping things that apply to both, such as "nominal phrase" inside but things that don't such as "compound noun" outside the "nominal" type and inside the "noun" type.

This will make it easier to differentiate linters that work only on pronouns or only one nouns from those that work on both.

[hippietrail]

Completes the split between nominals that group nouns and pronouns together vs places only nouns or only pronouns work.

Also renames article to determiner and groups the other words that work a lot like the articles, such as this, that, these, and those.

Adds some properties to other word types such as comparative and superlative to adjective, subject and object case to pronoun, etc. Most need more logic to be coded and some refactoring since the same affix changes different properties on different word types.

Adds notes in comments about word types and properties for future implementation.

[elijah-potter]

This is great work! I've gone ahead and made some minor fixes. I'm tempted to get this merged tomorrow, as long as you approve of my changes.