Project: Sprinkle override over all the projects

Change-Id: I5e03ef5a9fee03473152f8a7511d75a1818c3e05
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/pythoneditor/pythoneditorplugin.cpp

@@ -246,7 +246,7 @@ class PythonProject : public Project
 {
 public:
     PythonProject(PythonProjectManager *manager, const QString &filename);
-    ~PythonProject();
+    ~PythonProject() override;
 
     QString displayName() const override { return m_projectName; }
     IDocument *document() const override;