core: Implement DLNA's AnyContainer upload
core: Implement DLNA's AnyContainer upload

Implement DLNA feature that allows clients to upload items without having
to specify which container they should be put into.

Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,jku/rygel,Tarnyko/rygel,GNOME/rygel,jku/rygel,luisbg/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel