#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/RiuRecentFileActionProvider.cpp

@@ -22,6 +22,7 @@
 #include "RiaGuiApplication.h"
 #include "RiaLogging.h"
 #include "RiaStringListSerializer.h"
+#include "RiuMessageDialog.h"
 
 #include <QAction>
 #include <QDir>
@@ -152,7 +153,7 @@ void RiuRecentFileActionProvider::slotOpenRecentFile()
         }
         else
         {
-            RiaLogging::errorInMessageBox( nullptr, "File open", "Failed to import file located at\n" + fileName );
+            RiuMessageDialog::showError( nullptr, "File open", "Failed to import file located at\n" + fileName );
 
             removeFileName( fileName );
         }