Add VRChat and GitHub packages to Unity project

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

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+//-----------------------------------------------------------------------
+// <copyright file="PathUtilities.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.IO;
+    using System.Text;
+
+    /// <summary>
+    /// DirectoryInfo method extensions.
+    /// </summary>
+    public static class PathUtilities
+    {
+        /// <summary>
+        /// Determines whether the directory has a given directory in its hierarchy of children.
+        /// </summary>
+        /// <param name="parentDir">The parent directory.</param>
+        /// <param name="subDir">The sub directory.</param>
+        public static bool HasSubDirectory(this DirectoryInfo parentDir, DirectoryInfo subDir)
+        {
+            var parentDirName = parentDir.FullName.TrimEnd('\\', '/');
+
+            while (subDir != null)
+            {
+                if (subDir.FullName.TrimEnd('\\', '/') == parentDirName)
+                {
+                    return true;
+                }
+                else
+                {
+                    subDir = subDir.Parent;
+                }
+            }
+
+            return false;
+        }
+    }
+}