Release 8.2

Fixed server crash and record crash bug
Fixed memory release on hololens after call bug
Fixed switch device camera resolution bug
Add call self test toggle
Added Texture Convert demo
Added desktop video feature
Added UnityDeskVideo/UnityChatDemo_PC_DeskMode demo

Fixed video codec format bug

Update group chat demo UI
Fixed server record encode bug

Update server record videos
Convert videos data to mp4

Added group chat demo
Udp and Tcp servers are combined into one server
Fixed memory leak during Hololens call
Optimized udp network transmission
Support vuforia video

Update to Unity2019.4.11f1
Optimized video codec

Update AR capture (Support ARcore, ARkit, Vuforia Camera...)
Optimize HoloLens audio and video capture

support group video chat,
fix ios camera,
remove protobuf from sdk ,pure sdk,
add screen video capture,
add live demo

1.send custom texture video
2.add hololens holograme capture demo