Add more restrictions on code quality.
Prepare #62
Update #62 : import from database (deserialize) a group of items.
Update #62 add get/search/save operations.
Add some TODOs for #62
Update #62 : start of refactoring Metadatas. Remove conf for Preview/Rendered files (actually not used), remove multiple Preview/Rendered file(s) for 1 entry (actually not used).
Update #62 big Metadata refactoring.
Update #62 : refactoring Transcode package, implement hardcoded ffprobe Entry (de)serializers.
Update #62 refactoring FFprobe and end (de)serialisers implementation. Refactoring renderers (FF Albumartwork, Lowres, Snapshoot) and render file.
Update #62 : End to refactoring ffprobe/ffmpeg and validation side.
Update #62 : refactor deprecated functions for stat and for metadata files
Update #62 : end refactor metadata gc and remove "metadata-provider-type" key in database.
Update #63
Debug for #62
Merge commit '77826aaa931147d69342ea1a4432d2afa6dc2f0c'