Add Screenshot Feature (#2354)

* Add internal screenshot  capabilities

* update version notice

Ryujinx.Graphics.GAL/IRenderer.cs

@@ -6,6 +6,8 @@ namespace Ryujinx.Graphics.GAL
 {
     public interface IRenderer : IDisposable
     {
+        event EventHandler<ScreenCaptureImageInfo> ScreenCaptured;
+
         IPipeline Pipeline { get; }
 
         IWindow Window { get; }
@@ -44,5 +46,7 @@ namespace Ryujinx.Graphics.GAL
         void WaitSync(ulong id);
 
         void Initialize(GraphicsDebugLevel logLevel);
+
+        void Screenshot();
     }
 }