src: refactoring of GraphNode and GraphEdge classes

* common base class QtGraphNode
* derived class QtGraphNodeData for nodes representing the data model
* removed GraphNode and GraphEdge interface classes
* moved and renamed files for DummyNode and DummyEdge
* refactored includes throughout Graph UI related files

src/app/qt/view/graphElements/QtGraphNodeData.cpp

@@ -0,0 +1,66 @@
+#include "qt/view/graphElements/QtGraphNodeData.h"
+
+#include "utility/messaging/type/MessageActivateTokens.h"
+#include "utility/messaging/type/MessageFocusIn.h"
+#include "utility/messaging/type/MessageFocusOut.h"
+#include "utility/messaging/type/MessageGraphNodeMove.h"
+
+QtGraphNodeData::QtGraphNodeData(const Node* data, bool childVisible)
+	: m_data(data)
+	, m_childVisible(childVisible)
+{
+	this->setAcceptHoverEvents(true);
+
+	this->setName(data->getName());
+}
+
+QtGraphNodeData::~QtGraphNodeData()
+{
+}
+
+const Node* QtGraphNodeData::getData() const
+{
+	return m_data;
+}
+
+bool QtGraphNodeData::isDataNode() const
+{
+	return true;
+}
+
+Id QtGraphNodeData::getTokenId() const
+{
+	return m_data->getId();
+}
+
+void QtGraphNodeData::onClick()
+{
+	if (!m_isActive && !m_data->isType(Node::NODE_UNDEFINED | Node::NODE_NAMESPACE))
+	{
+		MessageActivateTokens(m_data->getId()).dispatch();
+	}
+}
+
+void QtGraphNodeData::moved()
+{
+	QtGraphNode::moved();
+
+	MessageGraphNodeMove(m_data->getId(), getPosition()).dispatch();
+}
+
+void QtGraphNodeData::updateStyle()
+{
+	GraphViewStyle::NodeStyle style =
+		GraphViewStyle::getStyleForNodeType(m_data->getType(), m_isActive, m_isHovering, m_childVisible);
+	setStyle(style);
+}
+
+void QtGraphNodeData::hoverEnterEvent(QGraphicsSceneHoverEvent* event)
+{
+	MessageFocusIn(m_data->getId()).dispatch();
+}
+
+void QtGraphNodeData::hoverLeaveEvent(QGraphicsSceneHoverEvent* event)
+{
+	MessageFocusOut(m_data->getId()).dispatch();
+}