Allow to show Pages Property Editor on Page Pane

[andrewtelnov]

And allow to customize the column list.
Here is the required code:

      Survey.Serializer.addProperty("page", {
        name: "pages:surveypages",
        className: "page",
        category: "general",
        displayName: "Page order",
        onGetValue: function (obj) {
          return !!obj && !!obj.survey ? obj.survey.pages : [];
        },
        onSetValue: function (obj) {
          //Do nothing
        },
        isSerializable: false,
      });
      SurveyCreator.SurveyQuestionEditorDefinition.definition["page@page"] = {
        properties: ["name"],
      };