Anonymous tokens would become visible if they had the same value as named tokens.
That's because they are merged for the lexer. But after this change, the rules for
visibility are based on their use in the rule, and not their name or identity.

* Removed the scanless parsing feature (dynamic lexing is king)
* Default LALR lexer is now contextual

It emulates antlr's visitor behavior for a dynamic evaluation order of subtrees

Syntax: symbol~number
      | symbol~min..max

Example:

  HEXCOLOR: "#" (HEXDIGIT~3 | HEXDIGIT~6)
  short_sentence: word~4..20

Added range for tokens

Breaking change!!

Big Thanks to Seth G of the mappyfile project for financing this feature!