Function interpolate

Create a function that maps from a numerical input array to a generic output array.

Accepts:

• Numbers
• Colors (hex, hsl, hsla, rgb, rgba)
• Complex (combinations of one or more numbers or strings)

const mixColor = interpolate([0, 1], ['#fff', '#000'])

mixColor(0.5) // 'rgba(128, 128, 128, 1)'
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TODO Revist this approach once we've moved to data models for values, probably not needed to pregenerate mixer functions.