Required for #170 (closed) and more generally for easier discovery/sharing. This MR implements a new screen an search capability that allow you to retrieve objects from the fediverse using their URL or username.
The following objects are supported:
For instance, it can be used as an easy way to make a public track from open.audio (or any other instance with public content) available on your own pod, without going through the library/subscription flow.
It's also a shorter way to follow libraries.
While it's not implemented yet, future iterations could improve the fetch behaviour to retrieve linked objects too (e.g retrieve an album and all the corresponding tracks).