[poppler] Preliminary movie support

[Hugo Mercier]

Hi,

Here is a patch based on the last git commit which add preliminary
access to movies.
It is based on the previous patch I sent to this list, but it has been
rewritten to better suit Annot modifications and to take movie options
into account.

Currently, the following features are supported :
- movies introduced before PDF 1.5 :
  - Parsing of 'Movie annotation' : a new AnnotMovie class has been added
  - Parsing of 'Movie Action' : a new LinkMovie class has been added
- movies introduced with PDF 1.5 :
  - Parsing of 'Screen annotation'  : new AnnotScreen added
  - Parsing of 'Rendition Action' (which may include embedded movies)
: new LinkRendition
 (a movie (with options), either originated from a movie annotation or
a rendition object is stored in a common 'Movie' object )
- Access to the movies through the glib frontend.

It still lacks parsing of some movie options, modifications of the qt
frontend to access movies and a lot of tests.


Of course, feel free to comment.
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