Core: Modernize

modernize-use-auto
modernize-use-nullptr
modernize-use-override
modernize-use-using
modernize-use-default-member-init (partially)

Change-Id: Idf10d7ffb1d98a04edc09a25c35e4e9e3abe87b5
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/progressmanager/progressview.h

@@ -64,8 +64,8 @@ private:
     void reposition();
 
     QVBoxLayout *m_layout;
-    QWidget *m_referenceWidget;
-    bool m_hovered;
+    QWidget *m_referenceWidget = nullptr;
+    bool m_hovered = false;
 };
 
 } // namespace Internal