Add Support for Post Processing Effects (#3616)

* Add Post Processing Effects

* fix events and shader issues

* fix gtk upscale slider value

* fix bgra games

* don't swap swizzle if already swapped

* restore opengl texture state after effects run

* addressed review

* use single pipeline for smaa and fsr

* call finish on all pipelines

* addressed review

* attempt fix file case

* attempt fixing file case

* fix filter level tick frequency

* adjust filter slider margins

* replace fxaa shaders with original shader

* addressed review

Ryujinx.Graphics.GAL/IWindow.cs

@@ -9,5 +9,9 @@ namespace Ryujinx.Graphics.GAL
         void SetSize(int width, int height);
 
         void ChangeVSyncMode(bool vsyncEnabled);
+
+        void SetAntiAliasing(AntiAliasing antialiasing);
+        void SetScalingFilter(ScalingFilter type);
+        void SetScalingFilterLevel(float level);
     }
 }