gitadora: arena cab volume change prevention (#478)

## Link to GitHub Issue, if one exists
#477 

## Description of change
Arena cab has two sound cards and it uses `WrappedIMMDeviceCollection`
to set the volume to 100% on boot on both, instead of the typical
`GetDefaultAudioEndpoint`.

## Testing
Testing Delta, testing other games as well as they are affected.

src/spice2x/hooks/audio/mme.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include <windows.h>
+
+namespace hooks::audio::mme {
+    void init(HINSTANCE module);
+}