Add pal_ramp_bivariate()
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This PR focuses on creating a
pal_ramp()equivalent for bivariate colour palettes like in the biscale package.It's difficult to make a generalizable solution to many dimensions that is also aesthetically pleasing. Currently I'm just testing different approaches. So far I've been able to match hand made palettes pretty well in a limited number of dimensions, but haven't managed to scale this infinitely.
I've also tried a solution based on blend modes; this scales easily but isn't as aesthetically pleasing.
Leaving this as a draft PR to tackle later on in development.