PR: Ohno (2013) Correlated Colour Temperature Performance Improvements

[KelSolaar]

Summary

This PR dramatically improves the performance of the Ohno (2013) CCT computations by use of caching and vectorised spectral conversion:

• colour.uv_to_CCT_Ohno2013 is ~100x faster
• colour.CCT_to_uv_Ohno2013 is ~425x faster

A definition that converts from CCT to CIE UCS colourspace uv chromaticity coordinates using Planck's Law has also been added:

• colour.CCT_to_uv_Planck1900

Preflight

Code Style and Quality

• Unit tests have been implemented and passed.
• Mypy static checking has been run and passed.
• Pre-commit hooks have been run and passed.
• [N/A] New transformations have been added to the Automatic Colour Conversion Graph.
• New transformations have been exported to the relevant namespaces, e.g. colour, colour.models.

Documentation

• New features are documented along with examples if relevant.
• The documentation is Sphinx and numpydoc compliant.

[coveralls]

Coverage decreased (-0.005%) to 99.891% when pulling f09af99 on feature/cct_optimisation into 7e4300a on develop.