audio: create a wrapper for asio drivers (#731)

## Link to GitHub Issue or related Pull Request, if one exists
n/a

## Description of change
Create `WrappedAsio`, similar to how we wrap `IAudioEndpoint`

So far, the wrapper does these things:

1. logging (for diagnosis, since iidx and gfdm don't produce any logs
when asio succeeds)
2. iidx32+ hack to work around refcount mismatch issue
3. sdvx valk cab hack to force 2-channel audio ("downmixing" by taking
only the front channels)
4. honor volume boost

As a result of `#2` the mempatch was removed from `iidx.cpp` since we
can tackle it cleanly in the hook. `#3` also removes the need for manual
patches.

Real downmixing is hard & expensive on the CPU so it was not
implemented.

## Testing
Tested iidx/sdvx/gfdm with xonar and flexasio

src/spice2x/hooks/audio/audio.cpp

@@ -14,6 +14,7 @@
 
 #include "audio_private.h"
 #include "acm.h"
+#include "asio_proxy.h"
 
 #ifdef _MSC_VER
 DEFINE_GUID(CLSID_MMDeviceEnumerator,
@@ -95,6 +96,10 @@ static HRESULT STDAPICALLTYPE CoCreateInstance_hook(
         // wrap object
         auto mmde = reinterpret_cast<IMMDeviceEnumerator **>(ppv);
         *mmde = new WrappedIMMDeviceEnumerator(*mmde);
+    } else if (ppv != nullptr && *ppv != nullptr && hooks::audio::asio::is_asio_creation(rclsid, riid)) {
+
+        // wrap every ASIO driver so calls pass through to the real driver
+        *ppv = hooks::audio::asio::wrap(rclsid, *ppv);
     }
 
     // return original result