[poppler] Improved annotation support

[Iñigo Martínez]

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Hi:

I have opened a bug with an attached patch that does improve annotation
support.

https://bugs.freedesktop.org/show_bug.cgi?id=11076

It does extend the annotation support to some basic types as, Text,
FreeText, Line and TextMarkup. Link and Widget implementations were
there and I have in mind to merge them with the new code improving their
support sometime in the future.

Currently the patch does improve annotation support but it is still work
in progress. At the moment there are some things missing, basically,
stream, direct/indirect reference and multitype entries.

Any suggestion is welcome,

Thank you,


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