New esp8266_4MB_max entry to test usermods / i2c

pio.ini: add esp8266_4MB_max with pir, dallas, relay  games (to test IMU) 

addHB: use string literal instead of var

appendConfigData to um multirelay

usermods/BME280_v2/usermod_bme280.h

@@ -401,7 +401,7 @@ public:
   }
 
   void appendConfigData() {
-    oappend(SET_F("addHB('")); oappend(_name); oappend("');");
+    oappend(SET_F("addHB('BME280/BMP280');"));
 
     oappend(SET_F("addInfo('BME280/BMP280:pin[]',0,'','I2C/SPI CLK');"));
     oappend(SET_F("disableRO('BME280/BMP280:pin[]',0);"));