Fixing headers for gateway modules (#1554)

* Fixing red squiggles in VSCode/PlatformIO

* Lint issues

main/config_FASTLED.h

@@ -24,6 +24,10 @@
 #ifndef config_FASTLED_h
 #define config_FASTLED_h
 
+extern void setupFASTLED();
+extern void FASTLEDLoop();
+extern void MQTTtoFASTLED(char*, char*);
+extern void MQTTtoFASTLED(char*, JsonObject&);
 /*-------------------FASTLED topics & parameters----------------------*/
 //FASTLED MQTT Subjects
 #define subjectMQTTtoFASTLED              "/commands/MQTTtoFASTLED"