adding nodeclick signal (paceholder#255)

Author: tatatupi

include/nodes/internal/FlowScene.hpp

@@ -124,6 +124,8 @@ class NODE_EDITOR_PUBLIC FlowScene
 
   void nodeDoubleClicked(Node& n);
 
+  void nodeClicked(Node& n);
+
   void connectionHovered(Connection& c, QPoint screenPos);
 
   void nodeHovered(Node& n, QPoint screenPos);

src/NodeGraphicsObject.cpp

@@ -337,6 +337,8 @@ mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
 
   // position connections precisely after fast node move
   moveConnections();
+
+  _scene.nodeClicked(node());
 }