Add setContextPropertyObject api

src/QGCQmlWidgetHolder.cpp

@@ -40,10 +40,15 @@ QGCQmlWidgetHolder::~QGCQmlWidgetHolder()
 
 void QGCQmlWidgetHolder::setAutoPilot(AutoPilotPlugin* autoPilot)
 {
-    _ui.qmlWidget->rootContext()->setContextProperty("autopilot", autoPilot);
+    setContextPropertyObject("autopilot", autoPilot);
 }
 
 bool QGCQmlWidgetHolder::setSource(const QUrl& qmlUrl)
 {
     return _ui.qmlWidget->setSource(qmlUrl);
 }
+
+void QGCQmlWidgetHolder::setContextPropertyObject(const QString& name, QObject* object)
+{
+    _ui.qmlWidget->rootContext()->setContextProperty(name, object);
+}

src/QGCQmlWidgetHolder.h

@@ -52,6 +52,8 @@ public:
     /// Sets the QML into the control. Will display errors message box if error occurs loading source.
     ///     @return true: source loaded, false: source not loaded, errors occured
     bool setSource(const QUrl& qmlUrl);
+    
+    void setContextPropertyObject(const QString& name, QObject* object);
 
 private:
     Ui::QGCQmlWidgetHolder _ui;