Issue #2376703 by slashrsm: Initial work for media entity integration.
Merge branch 'media_storage_plugin' into media_entity_plugin
Issue #2376703 by slashrsm: Media entity integration.
Issue #2376697 by slashrsm: File entity integration.
Issue #2376695 by slashrsm: Automatically set URI if not yet defined.
Issue #2376703 by slashrsm: Move media entity integration in a submodule.
Merge pull request #4 from slashrsm/media_entity_plugin

Media entity plugin