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/QtGraphNodeBundle.h

@@ -1,6 +1,7 @@
 #ifndef QT_GRAPH_NODE_BUNDLE_H
 #define QT_GRAPH_NODE_BUNDLE_H
 
+#include "data/graph/Node.h"
 #include "qt/view/graphElements/QtGraphNode.h"
 
 class QtCountCircleItem;
@@ -9,7 +10,7 @@ class QtGraphNodeBundle
 	: public QtGraphNode
 {
 public:
-	QtGraphNodeBundle(Id tokenId, size_t nodeCount, std::string name);
+	QtGraphNodeBundle(Id tokenId, size_t nodeCount, Node::NodeType type, std::string name);
 	virtual ~QtGraphNodeBundle();
 
 	// QtGraphNode implementation
@@ -27,6 +28,7 @@ protected:
 private:
 	QtCountCircleItem* m_circle;
 	Id m_tokenId;
+	Node::NodeType m_type;
 };
 
 #endif // QT_GRAPH_NODE_BUNDLE_H