panels: enforced setting an object name by using a mandatory constructor parameter

app/panel/viewer/viewerbase.cpp

@@ -22,8 +22,8 @@
 
 OLIVE_NAMESPACE_ENTER
 
-ViewerPanelBase::ViewerPanelBase(QWidget *parent) :
-  TimeBasedPanel(parent)
+ViewerPanelBase::ViewerPanelBase(const QString& object_name, QWidget *parent) :
+  TimeBasedPanel(object_name, parent)
 {
 }