Remove Aureal support

[Lgt2x]

Pull Request Type

• [ ] GitHub Workflow changes
• [ ] Documentation or Wiki changes
• [x] Build and Dependency changes
• [ ] Runtime changes
  • [ ] Render changes
  • [ ] Audio changes
  • [ ] Input changes
  • [ ] Network changes
  • [ ] Other changes

Description

D3 used to support Aureal 3-Dimensional sound cards, providing 3D spatial audio. The hardware and drivers is outdated, so all support in code has been removed, including UI mixer setting.

Read more about A3D here: https://en.wikipedia.org/wiki/Aureal_Semiconductor#A3D

Checklist

• [x] I have tested my changes locally and verified that they work as intended.
• [x] I have documented any new or modified functionality.
• [x] I have reviewed the changes to ensure they do not introduce any unnecessary complexity or duplicate code.
• [x] I understand that by submitting this pull request, I am agreeing to license my contributions under the project's license.

[Lgt2x]

I did more testing and fixed an index problem in the debug mixer menu, we should be ready for review.

[winterheart]

Tested on Linux and no regression found. Ready to merge.