refactored score to type Score enum, for failure proof matching #77
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Currently, Entropy.score is a u8. This is problematic as foolproof matching is less than ideal in downstream code. The API doesn't make it clear that there are really only 5 variants from 0 to 4. One has to account for u8s higher than 4. Converting to the Score Enum just makes this clear and safer. This might be a backward incompatible change, but better to do this now than later.