XPS Annotator support XPS conversion to image

Now XPS Annotator is also XPS document converter to image file. Actually, this feature has existed since version 1.20, but in that version can only convert the XPS document to PNG format.

At version 1.21, the XPS Annotator can convert XPS documents not only to the PNG format but also to several image formats like JPEG, BMP, GIF and TIFF. In the days to come we will try to add the feature to change the size and image quality of the conversion result.