plrgbhls: Convert RGB color to HLS

`plrgbhls`: Convert RGB color to HLS
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#### `plrgbhls`: Convert RGB color to HLS

`plrgbhls (` | r,
| g,
| b,
| p_h,
| p_l,
| p_s`)`;

Convert RGB color coordinates to HLS

`r` (`PLFLT`, input)

  Red intensity (0.0-1.0) of the colour

`g` (`PLFLT`, input)

  Green intensity (0.0-1.0) of the colour

`b` (`PLFLT`, input)

  Blue intensity (0.0-1.0) of the colour

`p_h` (`PLFLT *`, output)

  Pointer to hue, in degrees on the colour cone (0.0-360.0)

`p_l` (`PLFLT *`, output)

  Pointer to lightness, expressed as a fraction of the axis of the colour cone (0.0-1.0)

`p_s` (`PLFLT *`, output)

  Pointer to saturation, expressed as a fraction of the radius of the colour cone (0.0-1.0)

Redacted form:

- General: `plrgbhls(r, g, b, p_h, p_l, p_s)`

- Perl/PDL: Not available? Implemented as plrgb/plrgb1?

This function is used in example 2.

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