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.Common/Configuration/AntiAliasing.cs

@@ -0,0 +1,12 @@
+namespace Ryujinx.Common.Configuration
+{
+    public enum AntiAliasing
+    {
+        None,
+        Fxaa,
+        SmaaLow,
+        SmaaMedium,
+        SmaaHigh,
+        SmaaUltra
+    }
+}