use video scaling instead of NPB luminance & new ABL (#4798)

* updated color scaling to preserve hue at low brightness resulting in much better colors
* replace NPBlg with NPB, moved brightness scaling to bus manager
* improved gamma table calculation: fixed mismatch in inverting gamma table calculation: inversion should now be as good as it gets
* code cleanup, fixed gamma being applied in unnecessary places

Improvements to ABL handling:
- removed strip level handling, ist now all done on bus level
- limiter now respects pixel mapping
- proper handling of white channel
- improved current estimation
- current is now always correctly reported to UI
- minimal FPS impact if the ABL is not limiting but slighly higher impact for global ABL limit due to double-scaling

- moved brightness scaling to BusDigital
- created new header file colors.h to be able to access color functions in bus-manager.
- updated colo_fade() with better video scaling to preserve hue's at low brightness
- added IRAM_ATTR to color_fade (negligible speed impact when compared to inline and benefits other functions)
- added IRAM_ATTR to color_blend as it is used a lot throughout the code, did not test speed impact but adding it to color_fade made it almost on-par with an inlined function

Additional changes:
- fixes for properly handling `scaledBri()` (by @blazoncek)
- also use bit-shift instead of division in blending for ESP8266
- improvements for faster "softlight" calculation in blending
- changed some variables to uint8_t to maybe let the compiler optimize better, uint8_t can be faster if read, store and set are all done in uint8_t, which is the case in the ones I changed
- various minor code formatting changes

wled00/led.cpp

@@ -57,7 +57,7 @@ void toggleOnOff()
 //scales the brightness with the briMultiplier factor
 byte scaledBri(byte in)
 {
-  unsigned val = ((uint16_t)in*briMultiplier)/100;
+  unsigned val = ((unsigned)in*briMultiplier)/100;
   if (val > 255) val = 255;
   return (byte)val;
 }
@@ -68,7 +68,7 @@ void applyBri() {
   if (realtimeOverride || !(realtimeMode && arlsForceMaxBri))
   {
     //DEBUG_PRINTF_P(PSTR("Applying strip brightness: %d (%d,%d)\n"), (int)briT, (int)bri, (int)briOld);
-    strip.setBrightness(scaledBri(briT));
+    strip.setBrightness(briT);
   }
 }