Add VRChat and GitHub packages to Unity project

Assets/Udon/Serialization/OdinSerializer/Utilities/Extensions/FieldInfoExtensions.cs

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+//-----------------------------------------------------------------------
+// <copyright file="FieldInfoExtensions.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.Utilities
+{
+    using System;
+    using System.Reflection;
+
+    /// <summary>
+    /// FieldInfo method extensions.
+    /// </summary>
+    public static class FieldInfoExtensions
+    {
+        /// <summary>
+        /// Determines whether the specified field is an alias.
+        /// </summary>
+        /// <param name="fieldInfo">The field to check.</param>
+        /// <returns>
+        ///   <c>true</c> if the specified field is an alias; otherwise, <c>false</c>.
+        /// </returns>
+        public static bool IsAliasField(this FieldInfo fieldInfo)
+        {
+            return fieldInfo is MemberAliasFieldInfo;
+        }
+
+        /// <summary>
+        /// Returns the original, backing field of an alias field if the field is an alias.
+        /// </summary>
+        /// <param name="fieldInfo">The field to check.</param>
+        /// /// <param name="throwOnNotAliased">if set to <c>true</c> an exception will be thrown if the field is not aliased.</param>
+        /// <returns></returns>
+        /// <exception cref="System.ArgumentException">The field was not aliased; this only occurs if throwOnNotAliased is true.</exception>
+        public static FieldInfo DeAliasField(this FieldInfo fieldInfo, bool throwOnNotAliased = false)
+        {
+            MemberAliasFieldInfo aliasFieldInfo = fieldInfo as MemberAliasFieldInfo;
+
+            if (aliasFieldInfo != null)
+            {
+                while (aliasFieldInfo.AliasedField is MemberAliasFieldInfo)
+                {
+                    aliasFieldInfo = aliasFieldInfo.AliasedField as MemberAliasFieldInfo;
+                }
+
+                return aliasFieldInfo.AliasedField;
+            }
+
+            if (throwOnNotAliased)
+            {
+                throw new ArgumentException("The field " + fieldInfo.GetNiceName() + " was not aliased.");
+            }
+
+            return fieldInfo;
+        }
+    }
+}