Add VRChat and GitHub packages to Unity project

Assets/VRCSDK/Dependencies/VRChat/Editor/ShaderStripping/StripPostProcessing.cs

@@ -0,0 +1,29 @@
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEditor.Build;
+using UnityEditor.Rendering;
+using UnityEngine;
+
+namespace VRC.SDKBase.Editor.ShaderStripping
+{
+    public class StripPostProcessing : IPreprocessShaders
+    {
+        public int callbackOrder => 0;
+
+        public void OnProcessShader(Shader shader, ShaderSnippetData snippet, IList<ShaderCompilerData> data)
+        {
+            if(EditorUserBuildSettings.activeBuildTarget != BuildTarget.Android)
+            {
+                return;
+            }
+
+            string shaderName = shader.name;
+            if(string.IsNullOrEmpty(shaderName) || !shaderName.Contains("PostProcessing"))
+            {
+                return;
+            }
+
+            data.Clear();
+        }
+    }
+}