Audio: Properly implements audio fallback for SoundIO (#500)

* Audio: Properly implements audio fallback for SoundIO

Given some drivers have issues with SoundIO (for the time being), this attempts to detect if SoundIO can open the default audio device, and then return false in IsSupported if it can't.

* Audio: Handle the backend disconnected event

libsoundio panics by default when a backend disconnects, this catches that event and gracefully handles it.

* Audio: Fix styling nits

* Audio: Fix nits

Because Ac_K. 😫

Ryujinx.Audio/Renderers/SoundIo/SoundIoAudioOut.cs

@@ -32,7 +32,66 @@ namespace Ryujinx.Audio
         /// <summary>
         /// True if SoundIO is supported on the device.
         /// </summary>
-        public static bool IsSupported => true;
+        public static bool IsSupported
+        {
+            get
+            {
+                SoundIO          context = null;
+                SoundIODevice    device  = null;
+                SoundIOOutStream stream  = null;
+
+                bool backendDisconnected = false;
+
+                try
+                {
+                    context = new SoundIO();
+
+                    context.OnBackendDisconnect = (i) => {
+                        backendDisconnected = true;
+                    };
+
+                    context.Connect();
+                    context.FlushEvents();
+
+                    if(backendDisconnected)
+                    {
+                        return false;
+                    }
+
+                    device = context.GetOutputDevice(context.DefaultOutputDeviceIndex);
+
+                    if(device == null || backendDisconnected)
+                    {
+                        return false;
+                    }
+
+                    stream = device.CreateOutStream();
+
+                    if(stream == null || backendDisconnected)
+                    {
+                        return false;
+                    }
+
+                    return true;
+                }
+                catch
+                {
+                    return false;
+                }
+                finally
+                {
+                    if(stream != null)
+                    {
+                        stream.Dispose();
+                    }
+
+                    if(context != null)
+                    {
+                        context.Dispose();
+                    }
+                }
+            }
+        }
 
         /// <summary>
         /// Constructs a new instance of a <see cref="SoundIoAudioOut"/>