Usermod SensorsToMqtt: Add bmp280+ccs811+si7021 sensors to wled and publish them via MQTT to Home Assistant (#1588)

* Adding SensorsToMqtt usermod, which allows WLED to read bmp280/SI7021/CCS811 sensors and publish it via MQTT to e.g. Home Assistant.

* undo some changes we dont want upstream

* undo some changes we dont want upstream2

Co-authored-by: Machiel Pronk <machiel.pronk89@gmail.com>

platformio.ini

@@ -120,6 +120,7 @@ build_flags =
   -D DECODE_SAMSUNG=true
   -D DECODE_LG=true
   -DWLED_USE_MY_CONFIG
+  ; -D USERMOD_SENSORSTOMQTT
 
 build_unflags =
   -Wall
@@ -210,6 +211,10 @@ lib_deps =
     #milesburton/DallasTemperature@^3.9.0
   #For BME280 sensor uncomment following
     #BME280@~3.0.0
+    ; adafruit/Adafruit BMP280 Library @ 2.1.0
+    ; adafruit/Adafruit CCS811 Library @ 1.0.4
+    ; adafruit/Adafruit Si7021 Library @ 1.4.0
+
 lib_ignore =
     AsyncTCP