Desktop and lbry.tv BitTorrent changes

lbry.tv will not support BitTorrent publishes (at least initially).

[ ] Add a setting on desktop only, enable bittorrent (I will revise copy, it will be disclaiming it's new / raw).
[ ] When setting is checked, pass flag to claim_search to include BitTorrent results (consult https://github.com/lbryio/lbry-sdk/issues/2767 for flag)
[ ] If lighthouse adds support for BitTorrent, pass appropriate flag (consult https://github.com/lbryio/lighthouse/issues/25)
[ ] When viewing a BitTorrent file, include some small indicator of this... somewhere (possibly just FileDetails, possibly an icon on FileTitle)
[ ] Improve UI for when file can't be streamed because it is downloading (for BitTorrent case, but possibly others). Display waiting on file to complete downloading.
[ ] Add basic, crude UI for when file completes but no streaming URL (in MVP, this will happen for non-streamable content AND some content that appears to be streamable but the SDK fails to generate a streaming_url). This UI should help you get to the file on your local file system.

lbryio / lbry-desktop