It is growing big and unwieldy. We should aim to break it up into more crates, and clean up some stuff.

Ideally re_viewer should only be UI code.

This needs some more planning before we execute, but some rough ideas:

• Move blueprinty non-gui stuff to own crate (re_blueprint)
• Break up app.rs
  • Show all loaded recordings as tabs #1905
  • selected_rec_id should be an Option
  • We should not create a LogDb until we get the first message to populate it with
• Refactor the different views (view_tensor, view_text, …), and maybe move them to their own crates
• …