API ride list add metadata

.. by default no metadata is provided when you
   get a ride list. So we now let you specify
   via a parameter what metadata fields you
   want.

   e.g.
   http://localhost:12021/athlete?metadata=all
   http://localhost:12021/athlete?metadata=Workout_Code,Recording_Interval

   Metric overrides are ignored and all data is
   fixed to never send a double quote ("), it is
   converted to a single quote (') to avoid tripping
   up CSV parsers.

   To show it is a string field both the heading and
   content are always surrounded by double quotes.

src/APIWebService.cpp

@@ -227,6 +227,17 @@ APIWebService::writeRideLine(RideItem &item, HttpRequest *request, HttpResponse
                 response->bwrite(QString("%1").arg(value, 'f').simplified().toLocal8Bit());
             }
         }
+
+        // all the metadata asked for
+        foreach(QString name, settings->metawanted) {
+            QString text = item.getText(name,"");
+            text.replace("\"","'"); // don't use double quotes!
+
+            response->bwrite(",\"");
+            response->bwrite(text.toLocal8Bit());
+            response->bwrite("\"");
+        }
+
         response->bwrite("\n");
     }
 }