BitStream: Live streaming

Apr 6, 2017

* Twitch updates: emotes saved to local database on-demand, no longer eating 20 MB of RAM; chat auto-scroll toggle; WebSocket fixes;
* Small renderer tweaks
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* UX tweaks; cleaner RTMP encoder dialog
* Camera FPS and encoder FPS options (to allow 60 fps input)
* YouTube 2160p (4K) and SuperChat replacing FanFundings
* Options to lock and remember camera rotation; device rotation detector on the fly
* Camera preview no longer uses fixed-fps rate to save battery while not encoding