Delete music and photos from the server via iOS (already available with shows and movies)

It seems that we can delete movies and TV shows via the iOS app (if it’s enabled on the server), but not music or photos. It would be especially useful with photos because I often over-shoot and prune after-the-fact, but really we should be able to delete any media from our libraries as long as it’s server-enabled.

It would go a long way toward making Plex a viable photo manager, especially with the camera upload feature.

Early 2021 clean-up: duplicate(s)