changed randomness and added optimizations

-added fully random palette function ('the old way', currently just used for initialization)
-changed randomness values to make it a little less random
-added 10% chance for pastel color palette
-now using swap() from std library for shuffeling
-changed function name
-moved update check from loadPalette() to handleRandomPalette() saving CPU cycles

wled00/fcn_declare.h

@@ -65,7 +65,8 @@ class NeoGammaWLEDMethod {
 uint32_t color_blend(uint32_t,uint32_t,uint16_t,bool b16=false);
 uint32_t color_add(uint32_t,uint32_t, bool fast=false);
 uint32_t color_fade(uint32_t c1, uint8_t amount, bool video=false);
-CRGBPalette16 generateRandomPalette(CRGBPalette16 &basepalette);
+CRGBPalette16 generateHarmonicRandomPalette(CRGBPalette16 &basepalette);
+CRGBPalette16 generateRandomPalette(void);
 inline uint32_t colorFromRgbw(byte* rgbw) { return uint32_t((byte(rgbw[3]) << 24) | (byte(rgbw[0]) << 16) | (byte(rgbw[1]) << 8) | (byte(rgbw[2]))); }
 void colorHStoRGB(uint16_t hue, byte sat, byte* rgb); //hue, sat to rgb
 void colorKtoRGB(uint16_t kelvin, byte* rgb);