add FSM3.0 src code not impl yet, add header guards and format main

lib/httpserver/httpserver.h

@@ -1,7 +1,7 @@
+#ifndef __HTTPSERVER_H
+#define __HTTPSERVER_H
 // Wrapper for ESP8266WebServer with Filesystem as HTTP source
 
-#pragma once
-
 #include <ESP8266WebServer.h>
 #include <stdarg.h>
 #include "filesys.h"
@@ -42,3 +42,5 @@ public:
     void logf(const char *format, ...);
     void logt(const char *format, ...);
 };
+
+#endif // __HTTPSERVER_H