Introduces new memory allocation functions, based on wled#4895 by @DedeHai
* keep a minimum of 15KB RAM available to UI - improves stability
* S3/S2/C3 automatically use "fast RTC Ram" for small data (reduces fragmentation)
* auto-detects PSRAM (or no PSRAM) when firmware was built with -D BOARD_HAS_PSRAM
* d_malloc() and d_calloc() prefer DRAM if possible (faster), but fall back to PSRAM when free RAM gets low.
* removed unnecessary sanity checks from sPC and gPC
* gPC: use inline color_fade() instead of FastLED .scale8()
in my tests on -S3 this gives a small speedup, 2% up to 6%
* make sure that gamma LUT is always initialized
* remove some unnecessary safety checks
* make gamma8() inline, for more speed
* use fast unGamma8 for preview
* add super-fast unGamma8 for HUB75 - old function lost 3-10 fps, this version does not reduce fps at all *grins*
Enable building color correction code if you really need it.
The effect of color correction is less noticeable on HUB75 than on ws2812b, however it can reduce your framerate by up to 10%.
previously gPC cached busses were disabled in slowMode (one pixel mapped to several outputs). However this should not be needed, because the first copy found should be like all other.
* optimize loops that scan through all busses
* small speedups for Bus::autoWhiteCalc()
* small speedups for ColorOrderMap::getPixelColorOrder()
thanks to github Copilot for giving me the right ideas for this optimization
This disables bus caching (and related speedups) while receiving realtime UDP pixels.
Its still totally unclear to me what happens, and why disabling the cache solves problems.
* BusManager::show(): explicitly wait until the bus driver is idle (done by NPB show, too, but in a different way)
* BusManager::removeAll(): use delay() instead of yield() - yield() does _not_ free the processor on esp32!
It seems that the FM6124 driver makes some "outdoor" panels work, that previously only showed random color flicker. FM6124 is largely compatible with panels that did work with the standard driver, too.
Art-Net Improvements
* AsyncUDP instead of WiFiUDP so it's much faster
* Support for professional Art-Net gear with many outputs
* Color-order remapping
* ESP32-P4 SIMD assembly optimization for brightness calc, a bit faster
* Full GUI support for all settings
* GUI guidance for setup
