speed optimisations, fix for restoreColorLossy, code cleanup (#4895)

- speed optimization in color_add, PS fast_color_add and blur functions
- applying more bit and shift manipulation tricks to squeeze out just a bit more speed on color manipulation functions.
- Optimization on blur is based on work by @blazoncek
- Renamed PS fast_color_add() to fast_color_scaleAdd()

wled00/data/settings_leds.htm

@@ -45,13 +45,13 @@
 		}
 		function bLimits(b,v,p,m,l,o=5,d=2,a=6) {
 			maxB  = b; // maxB - max physical (analog + digital) buses: 32 - ESP32, 14 - S3/S2, 6 - C3, 4 - 8266
-			maxD  = d; // maxD - max digital channels (can be changed if using ESP32 parallel I2S): 16 - ESP32, 12 - S3/S2, 2 - C3, 3 - 8266
-			maxA  = a; // maxA - max analog channels: 16 - ESP32, 8 - S3/S2, 6 - C3, 5 - 8266
 			maxV  = v; // maxV - min virtual buses: 6 - ESP32/S3, 4 - S2/C3, 3 - ESP8266 (only used to distinguish S2/S3)
 			maxPB = p; // maxPB - max LEDs per bus
 			maxM  = m; // maxM - max LED memory
 			maxL  = l; // maxL - max LEDs (will serve to determine ESP >1664 == ESP32)
 			maxCO = o; // maxCO - max Color Order mappings
+			maxD  = d; // maxD - max digital channels (can be changed if using ESP32 parallel I2S): 16 - ESP32, 12 - S3/S2, 2 - C3, 3 - 8266
+			maxA  = a; // maxA - max analog channels: 16 - ESP32, 8 - S3/S2, 6 - C3, 5 - 8266
 		}
 		function is8266() { return maxA ==  5 && maxD ==  3; } // NOTE: see const.h
 		function is32()   { return maxA == 16 && maxD == 16; } // NOTE: see const.h