[GB.POPPLER]
* NEW: PdfDocument: Find() method finds a page index from its label.
* NEW: PdfPage: Thumbnail property returns the thumbnail of a page if it exists.
* NEW: PdfPage: Label property returns the label of the page.
* NEW: PdfPage: Text property returns the text contents of the page.
* NEW: PdfPage: GetText() method returns the text contents of part of the page.
* NEW: PdfPage: Width and Height properties return the size of the page.
* NEW: PdfPage: FindText() method searches for a specific text in the page and return all the bounding boxes found.
[GB.POPPLER]
* NEW: Default resolution is now the same as the poppler library (72 DPI).
* NEW: PdfDocument: Add Max and Index.Max property.
* NEW: PdfDocument: Add Keywords, CreationDate and ModificationDate properties.
* NEW: PdfDocument: Add Linearized and Version properties.
* NEW: PdfDocument: PdfDocument.Index returns the document index as an read-only array of PdfIndex objects.
* NEW: PdfIndex: Action property returns the detail of the action associated with an index entry.
