ui: redesigned graph overview and use new list layouting within overview bundles

* overview bundles imitate style of bundled node type
* removed bundle for built-in types
* show contents of overview bundle in vertical list layouted with new ListLayouter
* nodes starting with the same letter are grouped with the letter displayed above
* pressing the letter key will scroll to the group
* also use this list layouting for namespace & package contents
* renamed BucketGrid to BucketLayouter
* moved used functions of GraphPostProcessor to GraphViewStyle and removed GraphPostProcessor

fortune cookie message = Don't be afraid to take that big step

src/lib_gui/qt/view/graphElements/QtGraphNode.cpp

@@ -5,15 +5,12 @@
 #include <QGraphicsSceneEvent>
 #include <QPen>
 
-#include "utility/ResourcePaths.h"
-
-#include "component/controller/helper/GraphPostprocessor.h"
-
 #include "qt/graphics/QtRoundedRectItem.h"
 #include "qt/utility/QtDeviceScaledPixmap.h"
 #include "qt/utility/utilityQt.h"
 #include "qt/view/graphElements/nodeComponents/QtGraphNodeComponent.h"
 #include "qt/view/graphElements/QtGraphEdge.h"
+#include "utility/ResourcePaths.h"
 
 void QtGraphNode::blendIn()
 {
@@ -250,6 +247,11 @@ bool QtGraphNode::isQualifierNode() const
 	return false;
 }
 
+bool QtGraphNode::isTextNode() const
+{
+	return false;
+}
+
 Id QtGraphNode::getTokenId() const
 {
 	return 0;
@@ -277,7 +279,7 @@ void QtGraphNode::addSubNode(const std::shared_ptr<QtGraphNode>& node)
 
 void QtGraphNode::moved(const Vec2i& oldPosition)
 {
-	setPosition(GraphPostprocessor::alignOnRaster(getPosition()));
+	setPosition(GraphViewStyle::alignOnRaster(getPosition()));
 }
 
 void QtGraphNode::onClick()