ARTI-FX support 8266 (experimental!!) add soundpressure

Add ARTI-FX to esp8266_4MB_M (experimental!)

Arti.h
- FREE_SIZE ESP.getFreeHeap() for 8266
- define asChar(x) to print to Serial/File depending on ESP32/8266
- artiPrintf: print to USER_PRINTF (experimental)

Arti_wled.h
- add ARDUINO_ARCH_ESP8266 to ARTI_ARDUINO
- add soundPressure

usermod_v2_artifx.h: use FREE_SIZE

wled00/FX.cpp

@@ -6310,7 +6310,7 @@ uint16_t mode_gravimeter(void) {                // Gravmeter. By Andrew Tuline.
     um_data = simulateSound(SEGMENT.soundSim);
   }
   float   volumeSmth  = *(float*)  um_data->u_data[0];
-  int16_t volumeRaw   = *(int16_t*)um_data->u_data[1];
+  // int16_t volumeRaw   = *(int16_t*)um_data->u_data[1]; //WLEDMM: this variable not used here
   float soundPressure = *(float*)  um_data->u_data[9];
   float agcSensitivity= *(float*)  um_data->u_data[10];
   #ifdef SR_DEBUG

wled00/FX_2Dfcn.cpp

@@ -583,7 +583,6 @@ bool Segment::jsonToPixels(char * name, uint8_t fileNr) {
       }
     }
   }
-  USER_PRINTLN();
 
   releaseJSONBufferLock();
   return true;

wled00/wled.h

@@ -8,7 +8,7 @@
  */
 
 // version code in format yymmddb (b = daily build)
-#define VERSION 2304061
+#define VERSION 2304070
 
 //uncomment this if you have a "my_config.h" file you'd like to use
 //#define WLED_USE_MY_CONFIG