changed structure of treppe.h and renamed treppe.cpp accordingly, added header guards

lib/httpserver/httpserver.h

@@ -1,6 +1,7 @@
-// Wrapper for ESP8266WebServer with Filesystem as HTTP source
+#ifndef __HTTPSERVER_H
+#define __HTTPSERVER_H
 
-#pragma once
+// Wrapper for ESP8266WebServer with Filesystem as HTTP source
 
 #include <ESP8266WebServer.h>
 #include <stdarg.h>
@@ -42,3 +43,5 @@ public:
     void logf(const char *format, ...);
     void logt(const char *format, ...);
 };
+
+#endif // __HTTPSERVER_H