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Update: support node ranges (fixes #89) (#190)

This adds a `range` option to the `parse` API. When enabled, each node has a [start, end] range property indicating its location in the comment.

When computing the range with the `unwrap: true` option, the returned range needs to track indices in the original comment, not the unwrapped version. To implement that behavior, this commit updates the unwrapping logic to use a regular expression rather than a state machine. When converting an index, the parser and re-matches the original comment line-by-line, keeping track of the number of discarded "wrapping" characters.

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