Better RAW-support (pictures)

While using RAW files in XBMC seems senseless, many photographers keep their RAW files in the same directory as the .JPEG equivalant. So RAW-files are listed as supported but they are surrounded by troubles.

Since a lot of development happened around pictures like the imagefactory, the new jpeg-encoding and Ulion's rewrite (and in XBMC in generel like threading, caching, etc) is not strange that some regression pops up. Making pictures threat-safe solved some problem and most remaining bugs are due to XBMC not being able to generate a thumbnail. It could be simply updating CXimage 6.x (which uses libdcr 8.91.) to the newest 7.0.1.0 version.. But since the image factory is committed, it seems the wish is to use libRAW to better support RAW pictures.

Supported RAW extensions: .orf (Olympus), .raw, .cr2, .dng, .rc2, .crw(Canon), .ARW (Sony), .NEF (Nikon), .DNG

Some bugs:
http://trac.xbmc.org/ticket/14419
http://trac.xbmc.org/ticket/14184
http://trac.xbmc.org/ticket/13974
crashing on generating .dng/.rc2 thumbs: http://trac.xbmc.org/ticket/13947
Pink .rc2 thumbs: http://trac.xbmc.org/ticket/14375
http://forum.xbmc.org/showthread.php?tid=157742

*.ARW has 2 bugs.
1> Caching .ARW over network: jpegparser is unable to load .arw files and then the threading crashes.
2> Displaying .ARW: Texture manager can not handle .ARW