dcrck / ultraviolet / eb6f07977c407d9926f9449473528d4654d2f87f

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optional args -> kwlist; support long interpolation

- refactor most functions with several optional arguments, e.g.
`mix`, `average`, etc. to use a keyword list of options instead. This
should hopefully make the API for these functions a bit clearer and
future-proof the functions against additional options.

- add the `:longer?` option to Scales, `mix` and `average`. When
`:longer?` is set to `true` and the provided `:space` has a hue channel,
hue interpolation will take the long way around the hue wheel. This can
create some interesting gradients in certain cases. The default behaviour
is still to go the short way around the hue wheel.

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