Video thumbnails (#376)

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* Preparing some scaffolding for video thumbnails

* Implemented thumbnail generation for videos
* Propagating errors of `Node` creation
* Using ffmpeg feature gate

* Introducing ffmpegthumbnailer-rs as a subcrate on core

* - rename to thumbnailer
- fix explorer thumbnail bug
- add more supported video types
- re-fix explorer performance

* remove nested licence

Co-authored-by: Jamie Pine <ijamespine@me.com>

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