Update HighchartsExportingOptions and HighchartsDataLabel interfaces (#11883)

* Update HighchartsExportingOptions and HighchartsDataLabel interfaces

The HighchartsExportingOptions and HighchartsDataLabels interfaces now
include all the properties present in Highcharts version 5.0.0.

* Make the "undersore methods" to protected ones in the definitions (#11715)

* Make the undersore methods to protected ones

* Remove non-public _read method from Result-Stream

highcharts/highcharts.d.ts

@@ -2215,6 +2215,13 @@ declare namespace __Highcharts {
          * @since 2.0
          */
         enabled?: boolean;
+        /**
+         * Function to call if the offline-exporting module fails to export a chart on the client side, and
+         * fallbackToExportServer is disabled. If left undefined, an exception is thrown instead.
+         * @default undefined
+         * @since 5.0.0
+         */
+        error?: Function;
         /**
          * Whether or not to fall back to the export server if the offline-exporting module is unable to export the chart on
          * the client side.
@@ -2235,6 +2242,22 @@ declare namespace __Highcharts {
          * @since 3.0.8
          */
         formAttributes?: any;
+        /**
+         * Path where Highcharts will look for export module dependencies to load on demand if they don't already exist on
+         * window. Should currently point to location of CanVG library (https://github.com/canvg/canvg) and RGBColor.js, 
+         * required for client side export in certain browsers.
+         * @default 'http://code.highcharts.com/{version}/lib'
+         * @since 5.0.0
+         */
+        libUrl?: string;
+        /**
+         * When printing the chart from the menu item in the burger menu, if the on-screen chart exceeds this width, it is
+         * resized. After printing or cancelled, it is restored. The default width makes the chart fit into typical paper
+         * format. Note that this does not affect the chart when printing the web page as a whole.
+         * @default 780
+         * @since 4.2.5
+         */
+        printMaxWidth?: number;
         /**
          * Defines the scale or zoom factor for the exported image compared to the on-screen display. While for instance a
          * 600px wide chart may look good on a website, it will look bad in print. The default scale of 2 makes this chart
@@ -2898,6 +2921,13 @@ declare namespace __Highcharts {
          * @since 2.2.1
          */
         borderWidth?: number;
+        /**
+         * A class name for the data label. Particularly in styled mode, this can be used to give each series' or point's
+         * data label unique styling. In addition to this option, a default color class name is added so that we can give
+         * the labels a contrast text shadow.
+         * @since 5.0.0
+         */
+        className?: string;
         /**
          * The text color for the data labels.
          * @default null
@@ -2958,6 +2988,13 @@ declare namespace __Highcharts {
          * @since 2.2.1
          */
         padding?: number;
+        /**
+         * Whether to reserve space for the labels. This can be turned off when for example the labels are rendered inside 
+         * the plot area instead of outside.
+         * @default true
+         * @since 4.1.10
+         */
+        reserveSpace?: boolean;
         /**
          * Text rotation in degrees. Note that due to a more complex structure, backgrounds, borders and padding will be
          * lost on a rotated data label.