Start the WASAPI COM thread when initializing the backend

COM doesn't make this easy. We want to be able to get device change
notifications without an open device, but we need an IMMDeviceEnumerator object
to register the notification client, which requires COM to be initialized. COM
must then stay initialized while we have the IMMDeviceEnumerator object, which
we can't assume for the calling thread so it has to be done in the COM thread.

Consequently, the COM thread must stay alive and can't quit while the DLL is
loaded if we want to get those notifications without an open device, and as
there's no reliable way to make the thread quit during DLL unload, the DLL must
stay pinned until process exit.

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