[WebRTC] control microphone gain via custom audio processor.

Previously, there were two places audio gain could be controlled:
- the device manager
- the audio track

The device manager audio gain control sets the system gain for all applications,
not just the webrtc application.

The audio track gain happens well after the audio processing where we want it to happen.

So, gain control was added to the existing custom audio processor, which previously only
handled calculating and retrieving the audio levels.

After these changes, the microphone gain slider does impact the audio volume heard by peers.

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