#13126 RiaLogging: Extract errorInMessageBox to RiuMessageDialog

Move the QMessageBox-displaying helper out of the logging utility into a
dedicated UI class. RiaLogging.h no longer pulls QMessageBox/QWidget into
the ~270 files that include it. Behavior is preserved: showError displays
the dialog when running interactively (and not under regression tests),
then forwards the text to RiaLogging::error.

ApplicationLibCode/UserInterface/Riu3DMainWindowTools.cpp

@@ -20,6 +20,7 @@
 
 #include "RiaGuiApplication.h"
 #include "RiaLogging.h"
+#include "RiuMessageDialog.h"
 
 #include "RiuMainWindow.h"
 
@@ -62,5 +63,5 @@ void Riu3DMainWindowTools::selectAsCurrentItem( const caf::PdmObject* object, bo
 //--------------------------------------------------------------------------------------------------
 void Riu3DMainWindowTools::reportAndShowWarning( const QString& warningDialogHeader, const QString& warningtext )
 {
-    RiaLogging::errorInMessageBox( Riu3DMainWindowTools::mainWindowWidget(), warningDialogHeader, warningtext );
+    RiuMessageDialog::showError( Riu3DMainWindowTools::mainWindowWidget(), warningDialogHeader, warningtext );
 }