ICore: Change some path API to use FilePath

Change-Id: Id841d6177206a021c9e606ce560b47d1ae6e52b9
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/fileutils.cpp

@@ -890,6 +890,11 @@ QVariant FilePath::toVariant() const
     return m_data;
 }
 
+QDir FilePath::toDir() const
+{
+    return QDir(m_data);
+}
+
 bool FilePath::operator==(const FilePath &other) const
 {
     if (!m_url.isEmpty())