parser: updated rules
parser: updated rules

  - 'Identifier' now uses 'text' to join parts
  - Added 'UnicodeEscapeSequence' to 'IdentifierStart'
  - 'LiteralMatcher' now returns a 'rawText' property
  - Removed types 'boolean' and 'float' for 'DirectiveArgument'
  - Updated 'Unicode Character Categories' to '8.0.0'

erispa/pegx