Add VRChat and GitHub packages to Unity project

Assets/VRCSDK/Dependencies/VRChat/Editor/VRCCachedWWW.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Security.Cryptography;
+using UnityEngine;
+using UnityEngine.Networking;
+
+public static class VRCCachedWWW {
+    public const float DefaultCacheTimeHours = 24 * 7;
+
+    public static void ClearOld(float cacheLimitHours = DefaultCacheTimeHours)
+    {
+        string cacheDir = CacheDir;
+        if (System.IO.Directory.Exists(cacheDir))
+        {
+            foreach (string fileName in System.IO.Directory.GetFiles(cacheDir))
+            {
+                if (GetAge(fileName) > cacheLimitHours)
+                {
+                    Debug.Log($"Deleting {fileName}");
+                    System.IO.File.Delete(fileName);   
+                }
+            }
+        }
+    }
+
+    private static string CacheDir
+    {
+        get
+        {
+            return Application.temporaryCachePath;
+        }
+    }
+
+    public static IEnumerator Get(string url, System.Action<Texture2D> onDone, float cacheLimitHours = DefaultCacheTimeHours)
+    {
+        string cacheDir = CacheDir;
+        if (!System.IO.Directory.Exists(cacheDir))
+            System.IO.Directory.CreateDirectory(cacheDir);
+
+        string hash = CreateHash(url);
+        string cache = cacheDir + "/www_" + hash;
+
+        if (File.Exists(cache))
+        {
+            // Use cached file if it exists
+            
+            if (GetAge(cache) > cacheLimitHours)
+                File.Delete(cache);
+            else
+            {
+                var texture = new Texture2D(2, 2);
+                if (texture.LoadImage(File.ReadAllBytes(cache)))
+                {
+                    // load texture from disk and exit if we successfully read it
+                    texture.Apply();
+                    onDone(texture);
+                    yield break;   
+                }
+            }
+        }
+        
+        else
+        {
+            // No cached file, load it from url
+            using (UnityWebRequest uwr = UnityWebRequestTexture.GetTexture(url))
+            {
+                // Wait until request and download are complete
+                yield return uwr.SendWebRequest();
+                while (!uwr.isDone || !uwr.downloadHandler.isDone)
+                {
+                    yield return null;
+                }
+
+                var texture = DownloadHandlerTexture.GetContent(uwr);
+            
+                if(string.IsNullOrEmpty(uwr.error))
+                    File.WriteAllBytes(cache, uwr.downloadHandler.data);
+                
+                onDone(texture);
+                yield break;
+            }   
+        }
+        
+    }
+
+    private static string CreateHash(string _string)
+    {
+        SHA256 hash = SHA256.Create();
+        byte[] computed_hash = hash.ComputeHash(System.Text.Encoding.Default.GetBytes(_string));
+        return System.Uri.EscapeDataString(System.Convert.ToBase64String(computed_hash));
+    }
+
+    private static double GetAge(string file)
+    {
+        if (!System.IO.File.Exists(file))
+            return 0;
+
+        System.DateTime writeTime = System.IO.File.GetLastWriteTimeUtc(file);
+        return System.DateTime.UtcNow.Subtract(writeTime).TotalHours;
+    }
+}