WASAPI: Improve how default devices are created to support automatic stream routing

[sidit77]

Use ActivateAudioInterfaceAsync to create default input/output devices to support automatic stream routing.

Related issues: #740

Open questions:

• [ ] Fallback for windows versions <1607
• [ ] Implementation of device name/eq
• [ ] What happens when the is no default device (can this even happen?)

[snylonue]

Will the pr be merged? The feature is quite important to handle device changes IMO.