Reworking effects which search multiple zones

Right now the way we handle searching more than one zone (for example [[Runed Crown]] or [[Gate to the Afterlife]]) is to give the player a choice of which zone to search, after which they search. The problem here is twofold: first, the user interface could be cleaner, and second, [[Opposition Agent]] needs to be able to control the player when they're searching that zone.

We'll need a new UI for searching multiple zones at once and we'll need to refactor a lot of cards to make this work correctly.