Issue #2172885 by ja_ca, ChrisjuhB, boztek, tim-e | andypost: Provide a menu link to add new media entity.
Issue #2143635 by blueminds, andypost | slashrsm: Create views wizards (media & media revision).
Issue #2128889 by andypost, Berdir, blueminds | slashrsm: Create media entity view builder.