Migrate Audio service to new IPC (#6285)

* Migrate audren to new IPC

* Migrate audout

* Migrate audin

* Migrate hwopus

* Bye bye old audio service

* Switch volume control to IHardwareDeviceDriver

* Somewhat unrelated changes

* Remove Concentus reference from HLE

* Implement OpenAudioRendererForManualExecution

* Remove SetVolume/GetVolume methods that are not necessary

* Remove SetVolume/GetVolume methods that are not necessary (2)

* Fix incorrect volume update

* PR feedback

* PR feedback

* Stub audrec

* Init outParameter

* Make FinalOutputRecorderParameter/Internal readonly

* Make FinalOutputRecorder IDisposable

* Fix HardwareOpusDecoderManager parameter buffers

* Opus work buffer size and error handling improvements

* Add AudioInProtocolName enum

* Fix potential divisions by zero

src/Ryujinx.HLE/HOS/Kernel/SupervisorCall/ExternalEvent.cs

@@ -0,0 +1,25 @@
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using Ryujinx.Horizon.Common;
+
+namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
+{
+    readonly struct ExternalEvent : IExternalEvent
+    {
+        private readonly KWritableEvent _writableEvent;
+
+        public ExternalEvent(KWritableEvent writableEvent)
+        {
+            _writableEvent = writableEvent;
+        }
+
+        public readonly void Signal()
+        {
+            _writableEvent.Signal();
+        }
+
+        public readonly void Clear()
+        {
+            _writableEvent.Clear();
+        }
+    }
+}