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Implement new version of Opus (v1.2)

New version of Opus is out, lots of improvements, also for speech
https://hydrogenaud.io/index.php/topic,114234/topicseen.html
https://people.xiph.org/~jm/opus/opus-1.2/

"- Speech quality improvements especially in the 12-20 kbit/s range
- Improved VBR encoding for hybrid mode
- More aggressive use of wider speech bandwidth, including fullband speech starting at 14 kbit/s
- Music quality improvements in the 32-48 kb/s range
- Generic and SSE CELT optimizations
- Support for directly encoding packets up to 120 ms
- DTX support for CELT mode
- SILK CBR improvements
- Support for all of the fixes in draft-ietf-codec-opus-update-06 (the mono downmix and the folding fixes need --enable-update-draft)
- Many bug fixes, including integer wrap-arounds discovered through fuzzing (no security implications)

There are no known regressions compared to the latest stable release (1.1.5). Please report any problems."

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