Move contributed sources to contrib directory

.. Makes it easier to identify code that has been snaffled in from
   other repositories and check licensing

.. The httpserver is now no longer optional, since it is delivered
   as contributed source.

contrib/httpserver/httprequesthandler.cpp

@@ -0,0 +1,19 @@
+/**
+  @file
+  @author Stefan Frings
+*/
+
+#include "httprequesthandler.h"
+
+HttpRequestHandler::HttpRequestHandler(QObject* parent)
+    : QObject(parent)
+{}
+
+HttpRequestHandler::~HttpRequestHandler() {}
+
+void HttpRequestHandler::service(HttpRequest& request, HttpResponse& response) {
+    qCritical("HttpRequestHandler: you need to override the service() function");
+    wDebug("HttpRequestHandler: request=%s %s %s",request.getMethod().data(),request.getPath().data(),request.getVersion().data());
+    response.setStatus(501,"not implemented");
+    response.write("501 not implemented",true);
+}