move main JSON doc into PSRAM (experimental)

this should move the main JSON doc into PSRAM on WROVER boards.
* free heap should increase by ~60kb
* PSRAM use should go up by the same amount.

wled00/wled.h

@@ -8,7 +8,7 @@
  */
 
 // version code in format yymmddb (b = daily build)
-#define VERSION 2305030
+#define VERSION 2305040 // May-the-4th be with you ;-)
 
 //uncomment this if you have a "my_config.h" file you'd like to use
 //#define WLED_USE_MY_CONFIG
@@ -733,8 +733,19 @@ WLED_GLOBAL int8_t spi_sclk  _INIT(-1);
 WLED_GLOBAL int8_t spi_sclk  _INIT(HW_PIN_CLOCKSPI);
 #endif
 
+#if defined(BOARD_HAS_PSRAM) && (defined(WLED_USE_PSRAM_JSON) || defined(WLED_USE_PSRAM))
+// put the main JSON "doc" into PSRAM
+#ifndef WLED_DEFINE_GLOBAL_VARS
+extern PSRAMDynamicJsonDocument doc;
+#else
+PSRAMDynamicJsonDocument doc(JSON_BUFFER_SIZE); // call constructor - fingers crossed that PSRAM is already initialized at this point ...
+#endif
+
+#else // standard: use global (.bss) RAM
 // global ArduinoJson buffer
 WLED_GLOBAL StaticJsonDocument<JSON_BUFFER_SIZE> doc;
+#endif
+
 WLED_GLOBAL volatile uint8_t jsonBufferLock _INIT(0);
 
 // enable additional debug output