updated media api tests
reimplemented media destination UI (dropdowns) and backend (ArtMedia)
refactored MediaFile/Art/Collection to base from same Item object, updated affected fixtures, tests and templates
added shorcut poi->mediafile data method, updated original_filename in media
cleaned up tests (POI and others)
added "art" api subset
multi-file artworks implementation: decoupled media files from arts
added media transit and media metadata API
added discovered API to media, added timestamp to usermedia
added user assets stats API
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