effect math sppedup - up to 3x faster

-> 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

wled00/wled.cpp

@@ -474,6 +474,8 @@ void WLED::setup()
   if (!Serial) delay(300);  // just a tiny wait to avoid problems later when acessing serial
 #endif
 
+  init_math();  // WLEDMM: pre-calculate some lookup tables
+
   #ifdef ARDUINO_ARCH_ESP32
   #if defined(WLED_DEBUG) && (defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32C3) || ARDUINO_USB_CDC_ON_BOOT)
   if (!Serial) delay(2500);  // WLEDMM allow CDC USB serial to initialise (WLED_DEBUG only)