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/PWM_fan/usermod_PWM_fan.h

@@ -287,9 +287,9 @@ class PWMFanUsermod : public Usermod {
     }
 
     void appendConfigData() {
-      oappend(SET_F("addHB('")); oappend(_name); oappend("');");
+      oappend(SET_F("addHB('PWM-fan');"));
     }
-    
+
     /*
      * addToConfig() can be used to add custom persistent settings to the cfg.json file in the "um" (usermod) object.
      * It will be called by WLED when settings are actually saved (for example, LED settings are saved)