-> distortion waves 3x speedup
-> hiphotic 2x speedup
-> waving cell 1.5x speedup
* replace sin8_t by lookup-table with pre-computed values
* moved integer sin and cos to fcn_declare.h (inlined by the compiler)
* moved gamma32 to fcn_declare.h (inlined by the compiler)
* a few other small tweaks
during testing at low brightness I noticed that gradients can be "jumping" in colors quite wildly, turning a smooth gradient into a flickering mess. This is due to the color hue preservation being inaccurate and a bit too aggressive. This can be seen for example using a gradient palette and "Running" FX.
Removing the hue preservation completely fixes it but leaves color artefacts for example visible in PS Fire at very low brightness: the bright part of the flames gets a pink hue. This change is a compromise to fix both problems to a "good enough" state
* moving color_blend, color_add, and color_fade to a seperate file, to allow the compiler to inline the functions.
* inlining slightly increases firmware size - original non-inline functions get used on 8266, or when WLEDMM_SAVE_FLASH is defined.
