Implement Display support in lead up to #7
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This is a step towards assert-rs#7. We can now display the expression under test. Next steps: - Ellipsis the strings being reported from this change. - Ability to enumerate failure cases. I'm mixed about building this enumeration functionality directly into `Predcate` or if we should instead provide an expanded trait that is only implemented when `Predicate` is `Display` and `T` is `Debug`. For now, I'm going with the simplest implementation, to assume every predicate will want this functionality. BREAKING CHANGES: - `Display` is now required to implement `Predicate`. - Generic traits (taking `T`) now require `T` to be `Debug`.
This can be important for - Clarifying the intent of a predicate, especially when looking at test results - Shortening `Predicate::display`s that are too big This is another step towards assert-rs#7.
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