FastLED 3.9.15
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Scale down a RGB to N/256ths of its current brightness, using "plain math" dimming rules.
"Plain math" dimming rules means that the low light levels may dim all the way to 100% black.
References CRGB(), and FASTLED_FORCE_INLINE.
Referenced by fl::blur1d(), fl::blurColumns(), fl::blurRows(), draw(), fill_2dnoise8(), and loop().