BitStream: Live streaming

Aug 27, 2016

* Added back fully-working HEVC hardware-encoding support. Stream or save MP4 files with H.265 video
* You can choose a video encoder by its native name.
* "Screen" source is always visible, but disabled on Android 4.4 and 4.3 with obvious explanation.

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* Force older Samsung encoders to mod-16 video width (output was garbage for 480p).
* Save user-provided RTMP address.
* Bottom menu is now visible on smaller screens.
* Camera auto-rotate can be disabled from Settings.