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This does some refactoring to the search controller and results class to handle the concept of not just searches, but other lists of tracks returned by the server. It's a little gross at times because it has to interface Swift's enums with the Objective-C side. I'm not sure if this is the best strategy, but it does seem to work for now; we can split out the new stuff into a separate controller if needed..
Note that the "quality" of the returned tracks is highly dependent on server configuration; Subsonic and Navidrome at least rely on last.fm for anything more intelligent than returning starred tracks.
Fixes GH-108 and GH-109.