plhlsrgb: Convert HLS color to RGB

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

`plhlsrgb (` | h,
| l,
| s,
| p_r,
| p_g,
| p_b`)`;

Convert HLS color coordinates to RGB.

`h` (`PLFLT`, input)

  Hue, in degrees on the colour cone (0.0-360.0)

`l` (`PLFLT`, input)

  Lightness, expressed as a fraction of the axis of the colour cone (0.0-1.0)

`s` (`PLFLT`, input)

  Saturation, expressed as a fraction of the radius of the colour cone (0.0-1.0)

`p_r` (`PLFLT *`, output)

  Pointer to red intensity (0.0-1.0) of the colour

`p_g` (`PLFLT *`, output)

  Pointer to green intensity (0.0-1.0) of the colour

`p_b` (`PLFLT *`, output)

  Pointer to blue intensity (0.0-1.0) of the colour

Redacted form:

- General: `plhlsrgb(h, l, s, p_r, p_g, p_b)`

- Perl/PDL: Not available? Implemented as plhls?

This function is used in example 2.

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