Add VRChat and GitHub packages to Unity project

Assets/Udon/Serialization/OdinSerializer/Unity Integration/UnitySerializationInitializer.cs

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+//-----------------------------------------------------------------------
+// <copyright file="UnitySerializationInitializer.cs" company="Sirenix IVS">
+// Copyright (c) 2018 Sirenix IVS
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace VRC.Udon.Serialization.OdinSerializer
+{
+    using UnityEngine;
+
+    /// <summary>
+    /// Utility class which initializes the Sirenix serialization system to be compatible with Unity.
+    /// </summary>
+    public static class UnitySerializationInitializer
+    {
+        private static readonly object LOCK = new object();
+        private static bool initialized = false;
+
+        public static bool Initialized { get { return initialized; } }
+
+        public static RuntimePlatform CurrentPlatform { get; private set; }
+        
+        /// <summary>
+        /// Initializes the Sirenix serialization system to be compatible with Unity.
+        /// </summary>
+        public static void Initialize()
+        {
+            if (!initialized)
+            {
+                lock (LOCK)
+                {
+                    if (!initialized)
+                    {
+                        // Ensure that the config instance is loaded before deserialization of anything occurs.
+                        // If we try to load it during deserialization, Unity will throw exceptions, as a lot of
+                        // the Unity API is disallowed during serialization and deserialization.
+                        GlobalSerializationConfig.LoadInstanceIfAssetExists();
+
+                        initialized = true;
+                        
+                        CurrentPlatform = Application.platform;
+
+                        if (Application.isEditor) return;
+
+                        if (CurrentPlatform == RuntimePlatform.Android)
+                        {
+                            using (var system = new AndroidJavaClass("java.lang.System"))
+                            {
+                                string architecture = system.CallStatic<string>("getProperty", "os.arch");
+                                ArchitectureInfo.SetIsOnAndroid(architecture);
+                            }
+                        }
+                        else
+                        {
+                            ArchitectureInfo.SetIsNotOnAndroid();
+                        }
+                    }
+                }
+            }
+        }
+
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+        private static void InitializeRuntime()
+        {
+            Initialize();
+        }
+
+#if UNITY_EDITOR
+
+        [UnityEditor.InitializeOnLoadMethod]
+#endif
+        private static void InitializeEditor()
+        {
+            Initialize();
+        }
+    }
+}