[poppler] [KPDF-PATCH] Read page mode from pdf

[Kristian Høgsberg]

Albert Astals Cid wrote:
> We use that to start directly in fullscreen if the pdf says so.
> 
> Albert

Just applied this patch with a couple of changes: I prefixed the enum 
values with pageMode, which seems to be xpdf convention for enums, and 
changed the dict parsing to use the obj->isName("UseThumbs") form, which 
is a little more concise.

cheers,
Kristian