Fixing headers for gateway modules (#1554)

* Fixing red squiggles in VSCode/PlatformIO

* Lint issues

main/config_INA226.h

@@ -28,6 +28,8 @@
 
 extern void setupINA226();
 extern void INA226toMQTT();
+extern void MeasureINA226();
+
 /*----------------------------USER PARAMETERS-----------------------------*/
 /*-------------DEFINE YOUR MQTT PARAMETERS BELOW----------------*/
 #define subjectINA226toMQTT      "/INA226toMQTT"