USB Dual Camera

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* Add a new option that allow you to select preferred video format on dual cameras mode
* Will use AV1 hardware accelerated encoder on supported devices
* Can use AV1+AAC format for video recording
* Provides AV1 encoding support for RTMP/FLV Live Push and can be used for YouTube Live broadcast
* Can push the video and audio to multiple live media server automatically after device connected
* New option "Auto open second camera" allow you control opening second camera manually or automatically