Remove num-traits and ordered-float

[Jasper-Bekkers]

Checklist

• [x] I have read the Contributor Guide
• [x] I have read and agree to the Code of Conduct
• [x] I have added a description of my changes and why I'd like them included in the section below

Description of Changes

This removes ordered-float as a dependency and replaces it with tiny-ordered-float which supports just enough use-cases for this library.

This is mostly done to remove the (very slow to compile) transitive dependency num-traits for this crate so we can keep it lean and mean.

Notice that this doesn't remove num-traits from the Cargo.lock because the optional macaw dependency still wants it, but we don't use that feature so I'll leave removing num-traits there as an exercise for the reader.

[davidpdrsn]

Seems the no-std build of tiny-ordered-float fails. We're removing no-std support for mirror-mirror 0.2 but for 0.1 we need to keep supporting it.

I was gonna file a PR to tiny-ordered-float but the GitHub repo seems to be private, at least https://github.com/Traverse-Research/tiny-ordered-float gives me a 404.

[Jasper-Bekkers]

I was gonna file a PR to tiny-ordered-float but the GitHub repo seems to be private, at least https://github.com/Traverse-Research/tiny-ordered-float gives me a 404.

I've made the repo public now.

[Jasper-Bekkers]

I've released a new version of tiny-ordered-float with no_std support, and I've updated this PR.