gwenview raw support

[Martin Kyral]

Hi,

I'd like to announce first version of the patch enabling raw support in
gwenview. It uses KDcraw to extract the embedded jpeg preview (most of the
raw formats contain it for the purposes of quick viewing the photos on the
camera display) so it is fast, implementing was quite easy and
theoretically it enables gwenview to support everything dcraw supports
(practically we need to test more formats). The patch does not perform
demosaicing and I don't think it shall - digikam, darktable or rawtherapee
are much more suited for developing the 'digital negatives'.

It is attached to https://bugs.kde.org/show_bug.cgi?id=158788

The patch enables support for Nikon NEF and NRW formats, Canon's CR2,
Pentax PEF, Sony ARW and Adobe DNG. If you want to try another format, just
adding it's MIME type to the list in lib/mimetypeutils.cpp shall be enough.

The patch contains just the basic functionality (thumbnails and viewing of
the raw images), however it is well usable. There is a lot of stuff to do
(see the commit message in the patch) so I'd appreciate any help.

Thanks,
Martin
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