Haydn: Part 1 (#2007)

* Haydn: Part 1

Based on my reverse of audio 11.0.0.

As always, core implementation under LGPLv3 for the same reasons as for Amadeus.

This place the bases of a more flexible audio system while making audout & audin accurate.

This have the following improvements:
- Complete reimplementation of audout and audin.
- Audin currently only have a dummy backend.
- Dramatically reduce CPU usage by up to 50% in common cases (SoundIO and OpenAL).
- Audio Renderer now can output to 5.1 devices when supported.
- Audio Renderer init its backend on demand instead of keeping two up all the time.
- All backends implementation are now in their own project.
- Ryujinx.Audio.Renderer was renamed Ryujinx.Audio and was refactored because of this.

As a note, games having issues with OpenAL haven't improved and will not
because of OpenAL design (stopping when buffers finish playing causing
possible audio "pops" when buffers are very small).

* Update for latest hexkyz's edits on Switchbrew

* audren: Rollback channel configuration changes

* Address gdkchan's comments

* Fix typo in OpenAL backend driver

* Address last comments

* Fix a nit

* Address gdkchan's comments

README.md

@@ -104,7 +104,7 @@ If you'd like to donate, please take a look at our [Patreon](https://www.patreon
 ## License
 
 This software is licensed under the terms of the MIT license.
-The Ryujinx.Audio.Renderer project is licensed under the terms of the LGPLv3 license.
+The Ryujinx.Audio project is licensed under the terms of the LGPLv3 license.
 This project makes use of code authored by the libvpx project, licensed under BSD and the ffmpeg project, licensed under LGPLv3.
 See [LICENSE.txt](LICENSE.txt) and [THIRDPARTY.md](Ryujinx/THIRDPARTY.md) for more details.