- The `setup` function name can be overridden with `setup`
(default ".setup")
- The entire `settings` option description can be overridden with
`settingsDescription`
- `luaName` and `setup` are used in the default description
- Replace all pre-formatted plugin defaults
- Move several options to `strLuaFn`
- Refactored "action" options to use a `mkAction` helper
- Fix some incorrect examples/tests
- Remove undocumented `filter_fn` from settings example