Support std::function

// src/corelib/io/qprocess.h
  typedef std::function<void(CreateProcessArguments *)> CreateProcessArgumentModifier;
  CreateProcessArgumentModifier createProcessArgumentsModifier() const;
  void setCreateProcessArgumentsModifier(CreateProcessArgumentModifier modifier);

// src/corelib/thread/qrunnable.h
  static QRunnable *create(std::function<void()> functionToRun);

// src/corelib/thread/qthreadpool.h:
  void start(std::function<void()> functionToRun, int priority = 0);
  bool tryStart(std::function<void()> functionToRun);

// src/widgets/dialogs/qfiledialog.h
  static void getOpenFileContent(const QString &nameFilter, const std::function<void(const QString &, const QByteArray &)> &fileContentsReady);

// src/oauth/qabstractoauth.h
  typedef std::function<void(Stage, QVariantMap*)> ModifyParametersFunction;
  ModifyParametersFunction modifyParametersFunction() const;
  void setModifyParametersFunction(const ModifyParametersFunction &modifyParametersFunction);

// src/remoteobjects/qremoteobjectnode.h
  typedef std::function<void (QUrl)> RemoteObjectSchemaHandler;
  void registerExternalSchema(const QString &schema, RemoteObjectSchemaHandler handler);
  typedef std::function<bool(const QString &, const QString &)> RemoteObjectNameFilter;
  bool proxy(const QUrl &registryUrl, const QUrl &hostUrl={},
             RemoteObjectNameFilter filter=[](const QString &, const QString &) {return true; });
  bool reverseProxy(RemoteObjectNameFilter filter=[](const QString &, const QString &) {return true; });

// src/plugins/sensors/android/sensoreventqueue.h
  using Function = std::function<void()>;
  explicit FunctionEvent(const Function &function)

// src/serialbus/qcanbusdevice.h
  void setResetControllerFunction(std::function<void()> resetter);
  void setCanBusStatusGetter(std::function<CanBusStatus()> busStatusGetter);

// core/api/qwebenginecookiestore.h
  void setCookieFilter(const std::function<bool(const FilterRequest &)> &filterCallback);
  void setCookieFilter(std::function<bool(const FilterRequest &)> &&filterCallback);
  void setCookie(const QNetworkCookie &cookie, const QUrl &origin = QUrl());

// webenginewidgets/api/qwebengineprofile.h:
  void setNotificationPresenter(std::function<void(std::unique_ptr<QWebEngineNotification>)> notificationPresenter);