Switch to Opus audio codec. Support USB microphones.#110
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Previously, our microphone used a lot of CPU (~25%) with 3 piped processes and using the AAC codec. This has been significantly improved through a non-piped implementation using the Opus codec. Now we're at roughly 1-3% CPU for the microphone.
Removed ICS microphone support for now in favor of a new PR later on.
Notably, in addition to the significant CPU performance increase, Opus is required to support WebRTC livestreams (secluso/mobile_client#11). So this is stepping stone for that that is now complete.
Future work should fix livestream audio (as noted in #36). I did not attempt to solve that.
Pairs with secluso/os#31 for the OS compatibility side of things.
fixes secluso/os#19