Implement ISpatialAudioClient support on Windows #11306

For proper spatial sound support on Windows.

https://learn.microsoft.com/en-us/windows/win32/api/spatialaudioclient/nn-spatialaudioclient-ispatialaudioclient
https://learn.microsoft.com/en-us/windows/win32/coreaudio/spatial-sound

Windows Sonic for Headphones supports 128 total active objects, with the Low Frequency Effects (LFE) channel not actually being counted as an object -- so when an 8.1.4.4 channel bed is in use, 112 dynamic sound objects can be active.

I might look into it one day, but frankly not that interesting for me, so feel free to pick it up.