inline frequently used color utilities (up to 15% faster)

* 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.

wled00/colors.cpp

@@ -1,5 +1,6 @@
 #include "wled.h"
 
+#if !defined(ARDUINO_ARCH_ESP32) || !defined(WLEDMM_FASTPATH) || defined(WLEDMM_SAVE_FLASH)  // WLEDMM: color utils moved into colorTools.hpp, so comiler can inline calls (up to 12% faster)
 /*
  * Color conversion & utility methods
  */
@@ -108,6 +109,7 @@ IRAM_ATTR_YN __attribute__((hot)) uint32_t color_fade(uint32_t c1, uint8_t amoun
     return scaledcolor;
   }
 }
+#endif
 
 void setRandomColor(byte* rgb)
 {