ui: Improved horizontal graph layout

* extend horizontal edges to origin column width
* leave horizontal gap in the middle of the left and right buckets for routing edges
* move left and right buckets vertically so that edges enter and leave horizontally
* removed third pivoting for graph edges, all edges enter and leave relative to the node center now

src/lib_gui/qt/view/QtGraphView.cpp

@@ -987,6 +987,7 @@ QtGraphNode* QtGraphView::createNodeRecursive(
 
 	newNode->setPosition(node->position);
 	newNode->setSize(node->size);
+	newNode->setColumnSize(node->columnSize);
 	newNode->setIsActive(node->active);
 	newNode->setMultipleActive(multipleActive);