A note on the changes in `NodeTerm`.
`ParseError`for LR parser.
- `start_production` parser param now accepts a fully qualified rule name
instead of id. First production id for the given rule is used.
+ - `NodeTerm` keeps a reference to the token. `value` is now a read-only
+ property that proxies `token.value`.
- Support for arbitrary user meta-data.
See issue: https://github.com/igordejanovic/parglare/issues/57
- `ParseError` now has `symbols_expected`, `tokens_ahead` and
