Move solution and projects to src

src/Ryujinx.Horizon.Common/OnScopeExit.cs

@@ -0,0 +1,19 @@
+using System;
+
+namespace Ryujinx.Horizon.Common
+{
+    public struct OnScopeExit : IDisposable
+    {
+        private readonly Action _action;
+
+        public OnScopeExit(Action action)
+        {
+            _action = action;
+        }
+
+        public void Dispose()
+        {
+            _action();
+        }
+    }
+}