Hat migration for "bring" / "move"

[pokey]

• Automatically move the hats from the source to the target immediately after a "bring" / "move". This approach would result in a single hat corresponding to multiple locations in the case of a single-source-multiple-destination broadcast move (eg "bring funk air to after bat and cap")
  • We could create an alternate term for the source hats as well, eg "source gust", etc
  • Alternately we could leave the old hats and have the new ones be called "that gust" or "new gust"

Note: This behaviour already occurs with "clone"

See #414 for more context and an example use case

[jmegner]

Interesting implications when it comes to single-source-multiple-destination stuff. My hope is that implementation that works for just single source and single/first destination would give 90%+ of the benefit and be fairly simple (no "source/that/new" modifiers). I'd be very happy with that as a short term or even long term plan.