Move Internet Radio Search to Browser

[klay2000]

The internet radio search should probably be handled through something more akin to the file browser tab in the ui, to do this we'd probably need to add search and maybe favorites to that. Ultimately this would look something like Pandora does now. The main advantage of doing this is it removes the special case for internet radio in the stream creation modal and in the process adds some more features we would need for something like a full Spotify implementation.