"unrestricted" number of custom palettes (#4932)

- allow more than 10 custom palettes
- move palettes into CPP file
- Fix for minimizing cpal.htm (saves 2k of flash)
- shortened names in cpal, saves about 400 bytes of Flash after packing
- removed async from common.js loading to prevent errors on page loads if the file is not cached
- restricted nubmer of user palettes on ESP8266 to 10
- unrestricted number of user palettes on all other platforms (total max palettes: 256)
- added a warning when adding more than 10 palettes to let the user decide to risk it
- Bugfixes in palette enumeration, fixed AR palette adding
- AR palettes are now also added if there are more than 10 custom palettes

Co-authored-by: Blaž Kristan <blaz@kristan-sp.si>

wled00/const.h

@@ -6,7 +6,15 @@
  * Readability defines and their associated numerical values + compile-time constants
  */
 
-#define GRADIENT_PALETTE_COUNT 59
+constexpr size_t FASTLED_PALETTE_COUNT = 7;   // = sizeof(fastledPalettes) / sizeof(fastledPalettes[0]);
+constexpr size_t GRADIENT_PALETTE_COUNT = 59; // = sizeof(gGradientPalettes) / sizeof(gGradientPalettes[0]);
+constexpr size_t DYNAMIC_PALETTE_COUNT = 5;   // 1-5 are dynamic palettes (1=random,2=primary,3=primary+secondary,4=primary+secondary+tertiary,5=primary+secondary(+tertiary if not black)
+constexpr size_t FIXED_PALETTE_COUNT = DYNAMIC_PALETTE_COUNT + FASTLED_PALETTE_COUNT + GRADIENT_PALETTE_COUNT; // total number of fixed palettes
+#ifndef ESP8266
+  #define WLED_MAX_CUSTOM_PALETTES (255 - FIXED_PALETTE_COUNT) // allow up to 255 total palettes, user is warned about stability issues when adding more than 10
+#else
+  #define WLED_MAX_CUSTOM_PALETTES 10 // ESP8266: limit custom palettes to 10
+#endif
 
 // You can define custom product info from build flags.
 // This is useful to allow API consumer to identify what type of WLED version