Presets default name incl icons and checkbox defaults, info free stack

index.js
- add checked default values for preset brightness and segment bounds
- show free stack
- preset default name including icons

json.cpp
- serializeInfo: add freestack

wled00/json.cpp

@@ -985,6 +985,7 @@ void serializeInfo(JsonObject root)
   root[F("getflash")] = ESP.getFlashChipSize(); //WLEDMM and Athom, works for both ESP32 and ESP8266
 
   root[F("freeheap")] = ESP.getFreeHeap();
+  root[F("freestack")] = uxTaskGetStackHighWaterMark(NULL); //WLEDMM
   //WLEDMM: conditional on esp32
   #if defined(ARDUINO_ARCH_ESP32)
     root[F("minfreeheap")] = ESP.getMinFreeHeap();