Implement Debug for all public types

[wetheredge]

I put it immediately after Serialize/Deserialize, since after was more common. I also standardized the existing derives to Deserialize, Serialize, Debug, … order, but I can drop that commit if you'd prefer.

Debug implementations were checked with cargo clippy -- -Wmissing_debug_implementations

[woodruffw]

Cool, thank you!

Debug implementations were checked with cargo clippy -- -Wmissing_debug_implementations

Would you mind adding that to the lib.rs as well, so that it gets checks automatically on all clippy runs (including CI)? There are some existing allow/deny uses, so it should fit right in 🙂

[woodruffw]

Thanks @wetheredge!