UI: Add OBSQTDisplay::OnMove()/OnDisplayChange()

This plumbing will be useful when handling color space changes.

Currently does nothing, and only Windows is wired for now.

UI/window-basic-main.hpp

@@ -947,6 +947,13 @@ public:
 
 protected:
 	virtual void closeEvent(QCloseEvent *event) override;
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+	virtual bool nativeEvent(const QByteArray &eventType, void *message,
+				 qintptr *result) override;
+#else
+	virtual bool nativeEvent(const QByteArray &eventType, void *message,
+				 long *result) override;
+#endif
 	virtual void changeEvent(QEvent *event) override;
 
 private slots: