…ecast in years.

There's the possibility of reintroducing this for Sonos, if that's still supported, but the Sonos support is tacked on right now in a way that really hurts the code design, so it'll make more sense to add that back, if needed, than to preserve the functionality in its current form.

…was patched together in a way that really hurts code readability, modularity, correctness, etc.

This intentionally leaves the Sonos code disabled, so that we can hopefully refactor the Chromecast code into a better design.  Then we can re-incorporate Sonos support into that design in a better way.

…to clarify their meanings.

…method/attribute ambiguity, and moves print_available_devices to the cast module.

…atterns.