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This PR turns the crate into no_std compatible replacing std references with core + alloc and adding the std feature where needed(std::error::Error support).
Also tried to make the dependency on HashMap optional making extensions an optional feature, the ahash dependency shouldn't be an issue since it's already a dependency of hashbrown which is the the std HashMap implementation.

TypeId implements Ord, so how about using BTreeMap for extensions if there is no std, rather than not having it?

This looks really good. Wonder if the crate authors will get time to consider it?

Hm. I guess it doesn't get rid of allocations cause it relies on the extern crate alloc

I'm not sure about getting this into 1.0, but I do want to allow for it. I think the only breaking change would be to add a std feature that is default-on, yea? Then we could eventually fix up support with it off.

Yes. I got a feeling i've seen more std feature flags than the opposite no_std. Either way works though.

I created #637 which does that, allowing us to eventually add support later.