## Link to GitHub Issue, if one exists
Fixes#509
## Description of change
Implement `WrappedIAudioClient3`.
For now, we have only seen SDVX use it (EG final) and only when the
shared mode patch is enabled. Exclusive still goes through version 1.
This means that for V3 we can forego implementing backend conversion
logic (for now).
Only significant addition is `InitializeSharedAudioStream` and this IS
called by SDVX when shared mode patch is enabled.
## Testing
Tested EG final, tested year 1 data, also IIDX shared/exclusive wasapi.
bicarus
a6f29d6a5a