Commits on Apr 18, 2021

1. Implement relative and absolute methods for Lighten/Darken, Saturate …

   Add `lighten_fixed` and `darken_fixed` methods to the Shade trait. The
   `_fixed` functions inherit similar behavior to the old `lighten/darken`.
   The new implementation scales the color toward the maximum or minimum
   value for lightness or saturation. This should be more intuitive to
   adjust as a small factor could have drastically different results based
   on the color space. The same change is made for saturate/desaturate with
   corresponding `_fixed` methods.
   
   Add doc tests showing new behavior of Saturate and Shade
   Differentiate between the absolute and relative lighten/darken/saturate
   by using `amount` to refer to the fixed/absolute functions and `factor`
   when using the relative versions (the new default version is relative).
   
   Account for negative factors in the saturate and shade functions.

   

   okaneco committed Apr 18, 2021
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