Add CARBUS Analyzer file load.

- Generic CSV parses file without failures, so CARBUS must be higher.
- File may be loaded but will have no packets. Adjusted UI message for this case.
- Obviously if we got CANHACKER header, then file is already detected and there is no need to parse.

mainwindow.cpp

@@ -804,7 +804,7 @@ void MainWindow::updateFileStatus()
     QString output;
     if (model->rowCount() == 0)
     {
-        output = tr("No file loaded");
+        output = tr("No packets loaded");
     }
     else
     {