(graphics/R-colorspace) Updated 1.4.1 to 2.0.1

# colorspace 2.0-1

* Added two new palettes from the viridis family (_viridis_/_viridisLite_),
  namely `"Rocket"` and `"Mako"` in `sequential_hcl()`.

* Assure that all `do.call()` for the `ggplot2` scale functions are made with
  `envir = parent.frame()` in order to avoid problems with non-standard
  evaluation, as reported in:
  <https://stackoverflow.com/questions/66049336/paste-name-in-scale-fill-color-in-colorspace-does-not-work-in-a-loop>

* New function `extract_transparency()` for extracting alpha transparency
  from color specifications, either as numeric, integer, character or hexmode vectors.
  This accompanies the previously available function `adjust_transparency()`
  allowing for more flexible modifications of alpha transparencies in colors.

# colorspace 2.0-0

* Release of version 2.0-0 accompanying the publication of the paper
  "colorspace: A Toolbox for Manipulating and Assessing Colors and Palettes"
  in the _Journal of Statistcal Software_ at <https://doi.org/10.18637/jss.v096.i01>.
  The paper is a compact version of the package web page
  (<https://colorspace.R-Forge.R-project.org/>) including some more discussion
  of related methods and software along with some more references to the
  scientific literature.

* New function `adjust_transparency()` that adjusts the alpha transparency
  of some color specification and returns a hexadecimal string where
  the alpha component is modified, added, or removed.

* Added three more palettes from Fabio Crameri's scientific color maps
  (_scico_), namely `"Hawaii"` and `"Batlow"` in `sequential_hcl()` and
  `"Roma"` in `divergingx_hcl()`.

* Additional option `cvd` in `swatchplot()` so that color vision deficiency
  emulation can be included on the fly.

* Added _binned_ _ggplot2_ color scales (in addition to _discrete_ and
  _continuous_).

* Changed the default colors in `specplot()` from `rainbow_hcl(3)` to
  `qualitative_hcl(3)` which is darker and has more chroma. Also, the order
  of the legend has been reversed (Luminance / Chroma / Hue) so that the
  legend labels are closer to the axis that they pertain to.

* Improve the documentation of the `LUV()` and `LAB()` color spaces,
  pointing out that the `U`/`V` and `A`/`B` coordinates are _typically_
  in [-100, 100] but can actually be exceeded by highly saturated colors.

* Bug fix in `diverging_hcl()` and `divergingx_hcl()` where the central color
  of the diverging palette could sometimes collapse to transparent white
  due to numerical inaccuracies on 32-bit platforms.

* Improve the documentation of the `HSV()` and `HLS()` color spaces.
  These do NOT necessarily correspond to sRGB;  we can convert from
  these to any RGB space that we choose (linear or non-linear,
  any whitepoint).  In particular, if we want to convert from one of
  these color spaces to XYZ or beyond, we must first convert to a
  specific RGB color space.

(mef)