Improved context sensitive help

- create utilty function CGuiApplication::triggerShowHelp
- this function also uses "QWhatsThis::leaveWhatsThisMode" which solves the problem that the help was not properly called a 2nd time
- adjusted using classes

src/blackgui/components/dbownmodelsetformdialog.cpp

@@ -11,6 +11,7 @@
 #include "blackgui/components/dbmappingcomponent.h"
 #include "blackgui/components/dbownmodelsetformdialog.h"
 #include "blackgui/editors/ownmodelsetform.h"
+#include "blackgui/guiapplication.h"
 #include "blackmisc/logcategory.h"
 #include "blackmisc/logcategorylist.h"
 #include "blackmisc/simulation/distributorlist.h"
@@ -71,6 +72,12 @@ namespace BlackGui
             return QDialog::exec();
         }
 
+        bool CDbOwnModelSetFormDialog::event(QEvent *event)
+        {
+            if (CGuiApplication::triggerShowHelp(this, event)) { return true; }
+            return QDialog::event(event);
+        }
+
         void CDbOwnModelSetFormDialog::buttonClicked()
         {
             const QObject *sender = QObject::sender();