fix: use formatter function for all named types

[runeh]

I'd forgotten to use the formatRuntypeName everywhere, so the unformatted name was used some places, and that one didn't exist.

So we'd generate code like

const tagsRuntype = rt.Array(rt.string);

const post = rt.Record({title: rt.string, tags: tags}); // <- `tags` is wrong

I've propagated the settings object to all the formatters. We might need more settings in them in the future.