Added plugin object to qml context

src/rqt_demo_plugin.cpp

@@ -3,6 +3,7 @@
 
 #include "pluginlib/class_list_macros.hpp"
 #include <qnamespace.h>
+#include <qqml.h>
 #include <qsurfaceformat.h>
 PLUGINLIB_EXPORT_CLASS(mg::DemoPluginMg, rqt_gui_cpp::Plugin)
 
@@ -14,6 +15,7 @@ mg::DemoPluginMg::DemoPluginMg() : Plugin() {
   static bool typesRegistered = 0;
   if(!typesRegistered) {
     qmlRegisterType<LineItem>("LineItem", 1, 0, "LineItem");
+    qmlRegisterAnonymousType<DemoPluginMg>("DemoPlugin", 1);
     typesRegistered = 1;
   }
 }