A more modern VAD with pre-trained models

[snakers4]

I recently just searched the term "VAD" in github search and found many abandoned projects with some decent amount of traction, but mostly lacking pre-trained models.

So I decided to share our new pre-trained VAD:

• Please see this vad - https://github.com/snakers4/silero-vad
• Quality benchmarks here - https://github.com/snakers4/silero-vad#vad-quality-metrics
• Overall comparison with webrtc - https://github.com/wiseman/py-webrtcvad/issues/68