Revert "Delete external_lcd.hpp"

This reverts commit 77dbf204fa.

src/external_lcd.hpp

@@ -0,0 +1,12 @@
+#include <EasyNextionLibrary.h>
+#ifndef trigger_h
+#include "trigger.h"
+#endif
+#ifndef EXTERNAL_LCD_LOADED
+#define EXTERNAL_LCD_LOADED
+#include "user_code.hpp"
+class ExternalLCD: public EasyNex {
+    protected:
+        void callTriggerFunction();
+};
+#endif