ui: graph view layouting and member rendering

Added simple layouting functions (implementations for simple grid and circle layout).
Also the graph displays class members and connections (edges) to or from them "correctly" now.

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

@@ -0,0 +1,29 @@
+#include "qt/view/graphElements/QtGraphNodeMouseMovable.h"
+
+#include "qgraphicssceneevent.h"
+
+#include "qt/view/graphElements/QtGraphEdge.h"
+
+QtGraphNodeMouseMovable::QtGraphNodeMouseMovable(const Vec2i& position, const std::string& name, const Id tokenId)
+	: QtGraphNode(position, name, tokenId)
+{
+}
+
+QtGraphNodeMouseMovable::~QtGraphNodeMouseMovable()
+{
+}
+
+void QtGraphNodeMouseMovable::mousePressEvent(QGraphicsSceneMouseEvent* event)
+{
+	m_mouseOffset.x = event->pos().x();
+	m_mouseOffset.y = event->pos().y();
+}
+
+void QtGraphNodeMouseMovable::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
+{
+	this->setPos(event->scenePos().x() - m_mouseOffset.x, event->scenePos().y() - m_mouseOffset.y);
+
+	Vec2i p(event->scenePos().x(), event->scenePos().y());
+
+	notifyEdgesAfterMove();
+}