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

platformio.ini

@@ -827,6 +827,7 @@ build_flags_M =
   -D USERMOD_WEATHER ; WLEDMM usermod
   -D USERMOD_MPU6050_IMU ; gyro/accelero for USERMOD_GAMES (ONLY WORKS IF USERMOD_FOUR_LINE_DISPLAY NOT INCLUDED - I2C SHARING BUG)
   -D USERMOD_GAMES ; WLEDMM usermod
+  ; -D USERMOD_FASTLED ; WLEDMM usermod: CC BY-NC 3.0 licensed effects by Stefan Petrick, include this usermod only if you accept the terms!
   ;WLEDMM: only setting WLED_DEBUG_HOST is enough, ip and port can be defined in sync settings as well
   -D WLED_DEBUG_HOST='"192.168.x.x"' ;; to send debug messages over network to host 192.168.x.y - FQDN is also possible
   -D WLED_DEBUG_PORT=1768 ;; port for network debugging. default = 7868
@@ -1072,7 +1073,6 @@ build_flags = ${common.build_flags_esp8266}
   -D WLED_DISABLE_HUESYNC
   -D WLED_DISABLE_LOXONE
   ; -D USERMOD_AUDIOREACTIVE
-  ; -D USERMOD_ARTIFX ; to be done
   ; -UWLED_USE_MY_CONFIG
   -D USERMOD_PIRSWITCH
   -D USERMOD_DALLASTEMPERATURE ;; disabled because it hangs during usermod setup on -S3 (autodetect broken?)
@@ -1081,8 +1081,9 @@ build_flags = ${common.build_flags_esp8266}
   -D USERMOD_FOUR_LINE_DISPLAY
   -D USERMOD_MPU6050_IMU ; gyro/accelero for USERMOD_GAMES (ONLY WORKS IF USERMOD_FOUR_LINE_DISPLAY NOT INCLUDED - I2C SHARING BUG)
   -D USERMOD_GAMES ; WLEDMM usermod
+  -D USERMOD_ARTIFX
   ; -D WLED_DEBUG
-; monitor_filters = esp8266_exception_decoder
+monitor_filters = esp8266_exception_decoder
 lib_deps = ${esp8266.lib_deps}
   OneWire@~2.3.5 ; used for USERMOD_FOUR_LINE_DISPLAY and USERMOD_DALLASTEMPERATURE
   olikraus/U8g2 @ ^2.28.8 ; used for USERMOD_FOUR_LINE_DISPLAY 
@@ -1117,7 +1118,7 @@ build_flags = ${common.build_flags_esp8266} -D WLED_RELEASE_NAME=ESP8266
 lib_deps = ${esp8266.lib_deps}
   paulstoffregen/OneWire@~2.3.7 ;WLEDMM Softhack, we need this as well (instead of 2.3.5)?
   olikraus/U8g2 # @~2.33.15
-  Wire ; WLEDMM needed?
+  Wire ; WLEDMM ewowi, needed?
 
 [env:esp8266pro_16MB_S]
 extends = env:d1_mini