UTI: public.movie and public.item only

If an app use custom UTI for non-standard type (like .mkv), it should contain an appropriate entry in its Info.plist file like UTImportedTypeDeclarations that conforms to the public.movie UTI.

Also bumped version number.
Add more supported extensions.
Thumbnail: Check UTI first

It allows to create thumbnails for all files that conform to public.movie UTI. If this check failed, we check the file extension.
preview: Support more video containers

like .avi, .divx

We don't check for public.movie because some files like .mov/.m4v can be natively previewed in the QL window, so it doesn't break the default OS X behaviour.
Remove the only .mkv section

since it's not true anymore..