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R library for assigning colours to values

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Hi, we are stuck with an old (1.67) version of boost. I was able to get `colourvalues` working (compiles and passes tests) by making pretty minor edits here: https://github.com/SymbolixAU/colourvalues/blob/1236cbd8cf80f450f72ae229f5be3124de4fc9bd/inst/include/cardinal_cubic_b_spline.hpp#L25 It...

Originally posted in [mapdeck](https://github.com/SymbolixAU/mapdeck/issues/342) ``` library(colourvalues) library(bit64) x

some applications will need values in [0,1], so could divide the colour vector / value by 255.0 (only applicable to rgb values) for example, mapdeck / deck.gl binary data needs...

Add arguments to specify the range of the palette you want to use For example ```r colour_values( 1:256, begin = 0.0, end = 0.75 ) ``` will only use rows...