complete the skeleton of dquotes.subx

Still some failing tests:
  - emit-string-literal-data doesn't ignore metadata when computing the
    length of literal strings
  - emit-string-literal-data doesn't handle escape sequences

One issue doesn't have a failing test:
  - emit-metadata doesn't handle string literals containing '/'

All these open issues involve a common design question: how to parse a
'word' that includes a string literal that may include spaces.

For everything else I know words can't contain spaces and datums can't
contain slashes. But for string literals things are tougher.

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