Add VRChat and GitHub packages to Unity project

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

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+//-----------------------------------------------------------------------
+// <copyright file="LinqExtensions.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.Collections.Generic;
+
+    /// <summary>
+    /// Various LinQ extensions.
+    /// </summary>
+    public static class LinqExtensions
+    {
+        /// <summary>
+        /// Perform an action on each item.
+        /// </summary>
+		/// <param name="source">The source.</param>
+		/// <param name="action">The action to perform.</param>
+        public static IEnumerable<T> ForEach<T>(this IEnumerable<T> source, Action<T> action)
+        {
+            foreach (var item in source)
+            {
+                action(item);
+            }
+
+            return source;
+        }
+
+        /// <summary>
+        /// Perform an action on each item.
+        /// </summary>
+		/// <param name="source">The source.</param>
+		/// <param name="action">The action to perform.</param>
+        public static IEnumerable<T> ForEach<T>(this IEnumerable<T> source, Action<T, int> action)
+        {
+            int counter = 0;
+
+            foreach (var item in source)
+            {
+                action(item, counter++);
+            }
+
+            return source;
+        }
+
+        /// <summary>
+        /// Add a collection to the end of another collection.
+        /// </summary>
+        /// <param name="source">The collection.</param>
+        /// <param name="append">The collection to append.</param>
+        public static IEnumerable<T> Append<T>(this IEnumerable<T> source, IEnumerable<T> append)
+        {
+            foreach (var item in source)
+            {
+                yield return item;
+            }
+
+            foreach (var item in append)
+            {
+                yield return item;
+            }
+        }
+    }
+}