DMVS2

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1. Real-time video preview of up to 16 channels.
2. Support SADP online search, device adding, device network info edit and device activation.
3. Support image quality switch (between clear and fluent) for ezviz devices.
4. Improve the two-way audio performance, and echo is decreased.
5. Automatically turn off the audio of the video when two-way audio is enabled.
6. Fix the issue of unconformity between the time of the recorded file and actual time.
7. Support Vietnamese.