audio: Rewrite SoundIo bindings (#4088)

* audio: Rewrite SoundIo bindings

This rewrite SoundIo bindings to be safer and not a pedantic autogenerated mess.

* Address comments

* Switch DllImport to LibraryImport

* Address gdkchan's comment

Ryujinx.Audio.Backends.SoundIo/Native/SoundIoException.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Runtime.InteropServices;
+using static Ryujinx.Audio.Backends.SoundIo.Native.SoundIo;
+
+namespace Ryujinx.Audio.Backends.SoundIo.Native
+{
+    internal class SoundIoException : Exception
+    {
+        internal SoundIoException(SoundIoError error) : base(Marshal.PtrToStringAnsi(soundio_strerror(error))) { }
+    }
+}