Get Page width/height from Page

It would be helpful if we were able to get a page's width, height, and page number from the Page object rather than having to query the Document object (using Document.GetPageWidth(), etc).

For example:
- Page.getWidth()
- Page.getHeight()
- Page.getPageNum()

oh, you can pass page width and height to Page object when Document.GetPage invoked.
it means you can modify Document class and Page class.