Added possibility to extract audio_processing VAD annotations in the Quality Assessment tool.
Annotations are extracted into compressed Numpy 'annotations.npz' files.
Annotations contain information about VAD, speech level, speech probabilities etc.
TBR=alessiob@webrtc.org
Bug: webrtc:7494
Change-Id: I0e54bb67132ae4e180f89959b8bca3ea7f259458
Reviewed-on: https://webrtc-review.googlesource.com/17840
Commit-Queue: Alex Loiko <aleloi@webrtc.org>
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Alex Loiko <aleloi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20581}