New custom palettes editor (#5010)

* full refactoring, added live preview, better minifying in cdata.js
* update main UI buttons, support for gaps in cpal files, cpal UI cleanup
* fixed some layout issues, added un-ordered cpal deletion
* changed to tab indentation, paste button border color now holds stored color
* fix preview to work properly and some other fixes in UI
* always unfreeze
* new approach to loading iro.js, add harmonic random palette, many fixes.
* decoupling iro.j, update UI of cpal.htm
- load iro.js sequentially
- no parallel requests in cpal.htm
- update UI buttons
- fix showing sequential loading of palettes (using opacity)
- better UX for mobile (larger markers, larger editor)
- various fixes
* small change to buttons
* load iro.js dynamically, remove iro.js from index.htm, revert changes to cdata.js
* improved visibility for very dark/black palettes and markers

wled00/wled_server.cpp

@@ -6,6 +6,7 @@
 #include "html_ui.h"
 #include "html_settings.h"
 #include "html_other.h"
+#include "js_iro.h"
 #ifdef WLED_ENABLE_PIXART
   #include "html_pixart.h"
 #endif
@@ -36,6 +37,7 @@ static const char s_cache_control[]  PROGMEM = "Cache-Control";
 static const char s_no_store[]       PROGMEM = "no-store";
 static const char s_expires[]        PROGMEM = "Expires";
 static const char _common_js[]       PROGMEM = "/common.js";
+static const char _iro_js[]          PROGMEM = "/iro.js";
 
 
 //Is this an IP?
@@ -350,6 +352,10 @@ void initServer()
     handleStaticContent(request, FPSTR(_common_js), 200, FPSTR(CONTENT_TYPE_JAVASCRIPT), JS_common, JS_common_length);
   });
 
+  server.on(_iro_js, HTTP_GET, [](AsyncWebServerRequest *request) {
+    handleStaticContent(request, FPSTR(_iro_js), 200, FPSTR(CONTENT_TYPE_JAVASCRIPT), JS_iro, JS_iro_length);
+  });
+
   //settings page
   server.on(F("/settings"), HTTP_GET, [](AsyncWebServerRequest *request){
     serveSettings(request);