asio: cache result from CoCreateInstance to work around buggy asio drivers (#781)

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

## Description of change
IIDX likes to call `CoCreateInstance` and `init` multiple times on ASIO
drivers, but some ASIO drivers like `Neva Uno` really don't like that
and ends up crashing. In our wrapper, cache the instances and try to
reuse them for better compatibility.

## Testing
Worked fine for FlexASIO / Xonar AE / Realtek ASIO though none of these
drivers repro the crashing behavior.

src/spice2x/hooks/audio/audio.cpp

@@ -68,6 +68,15 @@ static HRESULT STDAPICALLTYPE CoCreateInstance_hook(
 
     HRESULT ret;
 
+    // ASIO: if we already hold a cached instance for this CLSID, hand back a fresh
+    // wrapper over it instead of re-creating the real driver (see asio_proxy.cpp)
+    if (ppv != nullptr && hooks::audio::asio::is_asio_creation(rclsid, riid)) {
+        if (IUnknown *reused = hooks::audio::asio::wrap_existing(rclsid)) {
+            *ppv = reused;
+            return S_OK;
+        }
+    }
+
     // call original
     ret = CoCreateInstance_orig(rclsid, pUnkOuter, dwClsContext, riid, ppv);
     if (FAILED(ret)) {
@@ -130,5 +139,9 @@ namespace hooks::audio {
             CLIENT = nullptr;
         }
         stop_low_latency();
+
+        // release the ASIO drivers we kept pinned for the process lifetime now that we are
+        // at a controlled shutdown point (see asio_proxy.cpp)
+        hooks::audio::asio::release_all_wrappers();
     }
 }