Implements show/hide of SectionContent + serialization of state (not yet

completed/tested).
Context menu also works with new impl.
Shows close button on top-right corner of SectionWidget.

AdvancedDockingSystem/src/SectionContentWidget.cpp

@@ -1,5 +1,6 @@
 #include "ads/SectionContentWidget.h"
 
+#include <QDebug>
 #include <QBoxLayout>
 
 ADS_NAMESPACE_BEGIN
@@ -15,4 +16,9 @@ SectionContentWidget::SectionContentWidget(SectionContent::RefPtr c, QWidget* pa
 	setLayout(l);
 }
 
+SectionContentWidget::~SectionContentWidget()
+{
+	qDebug() << Q_FUNC_INFO;
+}
+
 ADS_NAMESPACE_END