LibraryMetadata is saved to disk and loaded from it the next time needed.
Application exits cleanly
Added date component
Scenes are created with a date
Refactor so all scenes creations are done through templates
Updated sort widget with date sort
Merge pull request #757 from anserran/sceneorder

Scenes can now be ordered by creation date
Merge pull request #761 from RotaruDan/newViewport

LibraryMetadata is saved to disk and loaded from it the next time needed.