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/graphics/QtGraphicsView.cpp

@@ -66,7 +66,7 @@ QtGraphicsView::QtGraphicsView(QWidget* parent)
 
 float QtGraphicsView::getZoomFactor() const
 {
-	return m_appZoomFactor;
+	return m_appZoomFactor * m_zoomFactor;
 }
 
 void QtGraphicsView::setAppZoomFactor(float appZoomFactor)
@@ -181,6 +181,12 @@ void QtGraphicsView::mouseReleaseEvent(QMouseEvent *event)
 
 void QtGraphicsView::keyPressEvent(QKeyEvent* event)
 {
+	if (event->key() >= Qt::Key_A && event->key() <= Qt::Key_Z)
+	{
+		QChar c = event->text().at(0).toUpper();
+		emit characterKeyPressed(c);
+	}
+
 	bool moved = moves();
 
 	switch (event->key())

src/lib_gui/qt/graphics/QtGraphicsView.h

@@ -45,6 +45,7 @@ protected:
 
 signals:
 	void emptySpaceClicked();
+	void characterKeyPressed(QChar c);
 
 private slots:
 	void updateTimer();