v2.0.0 🚀

Highlights 🎉

• Core rules are no longer special-cased, they are brought in via parsing and compiling core.abnf
  • hence they can now be transformed, ignored, just like other rules
• Core rules are now all transformed to string format by default
  • so when matching *HEXDIG on "1A", instead of getting [49, 65], you get ["1", "A"]
  • however, performing List.to_string on either one gives you the same result - "1A"
• Core rules are defined only when they are not already defined in your abnf
  • if they are already defined in your abnf, they will be skipped
  • note the way we generate the functions unifies cases, so if you have char defined,
    the core rule CHAR will be ignored as well
  • this also makes it possible to override core rules