Qt6 port:

* Explicitly include some missing headers
* Use 'static const char*' for XPM icon
* Skip template parameters for qMakePair
* Constructor of QFileInfo is marked as 'explicit' now
* QString::fromLatin1() also accepts a QByteArray
* QDateTime::fromTime_t() is deprecated in Qt5 and has been removed in Qt6. Use QDateTime::fromSecsSinceEpoch()
* QDateTime::toTime_t() is deprecated in Qt5 and has been removed in Qt6. Use QDateTime::toSecsSinceEpoch()
* QApplication::globalStrut() is deprecated. Don't use it any more.
* QWidget::isTopLevel() is deprecated, use QWidget::isWindow()

src/Gui/DlgActionsImp.cpp

@@ -541,7 +541,7 @@ IconFolders::IconFolders(const QStringList& paths, QWidget* parent)
             removeButton->hide();
         }
 
-        buttonMap.append(qMakePair<QLineEdit*, QPushButton*>(edit, removeButton));
+        buttonMap.append(qMakePair(edit, removeButton));
         connect(removeButton, SIGNAL(clicked()), this, SLOT(removeFolder()));
     }