Switch to hashify phf, gain extra 20-30% unescape speed-up

[xamgore]

See #82 for details.

[danielparks]

Thanks for the PR! Sorry it’s taken me a while to get back to you — I’ve been sick, but now I’m better.

I wonder if it wouldn’t make sense just to switch to hashify entirely rather than phf? That would break the API and require a major version bump, but I imagine it wouldn’t cause a problem for most people.

The big issue right now is that cargo msrv is reporting that the MSRV is now 1.74.1, but the errors that older versions are throwing make me think this might be something that could be worked around. I'll dig into it more. (1.74.1 is more than a year old, so maybe just bumping MSRV is the way to go. Just figured I should check if it was something trivial first.)

[danielparks]

Ah, I see, hashify can’t generate something like ENTITIES.

[xamgore]

Yeah. phf provides the Map interface, I may ask hashify authors for something similar or even propose a PR. As well as downgrade the msrv. The source code is trivial, it would be easy.

• fix clippy warnings
• fix hashify msrv
• implement Map interface inside hashify