Create ComplexFloat trait to model Floats as a subset of Complex<T>

[obsgolem]

Resolves #2. Replaces #53. Nearly all the work here was already done by YakoYakoYokuYoku. I have merely updated it to master and made a few discretionary changes which I think improve the work slightly. More unit tests will be coming.

[YakoYakoYokuYoku]

If you want it you could add a Co-authored-by: Martin Reboredo <yakoyoku@gmail.com> at any one of your commit messages. LGTM otherwise.

[obsgolem]

I will certainly do so. Thanks!

[obsgolem]

Ping, any chance I could get a review before end of year?

[obsgolem]

Bump

[bluss]

Awesome work, I'm happy this trait comes alive.

[cuviper]

I tweaked a few more things, but I think we're good. :crossed_fingers: Thanks!

bors r+

[bors[bot]]

Build succeeded:

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