0239987f57dd928bf4bc4f73a882e4a19ee11194
Use macros from core-foundation for declaring types This cleans up the code a lot and gives an implementation of Clone. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-text-rs/79) <!-- Reviewable:end -->
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