Add VRChat and GitHub packages to Unity project

Assets/Udon/Serialization/OdinSerializer/Utilities/Misc/UnityVersion.cs

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+//-----------------------------------------------------------------------
+// <copyright file="UnityVersion.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 UnityEngine;
+
+    /// <summary>
+    /// Utility class indicating current Unity version.
+    /// </summary>
+#if UNITY_EDITOR
+
+    [UnityEditor.InitializeOnLoad]
+#endif
+    public static class UnityVersion
+    {
+        static UnityVersion()
+        {
+            string[] version = Application.unityVersion.Split('.');
+
+            if (version.Length < 2)
+            {
+                Debug.LogError("Could not parse current Unity version '" + Application.unityVersion + "'; not enough version elements.");
+                return;
+            }
+
+            if (int.TryParse(version[0], out Major) == false)
+            {
+                Debug.LogError("Could not parse major part '" + version[0] + "' of Unity version '" + Application.unityVersion + "'.");
+            }
+
+            if (int.TryParse(version[1], out Minor) == false)
+            {
+                Debug.LogError("Could not parse minor part '" + version[1] + "' of Unity version '" + Application.unityVersion + "'.");
+            }
+        }
+
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+        private static void EnsureLoaded()
+        {
+            // This method ensures that this type has been initialized before any loading of objects occurs.
+            // If this isn't done, the static constructor may be invoked at an illegal time that is not
+            // allowed by Unity. During scene deserialization, off the main thread, is an example.
+        }
+
+        /// <summary>
+        /// Tests current Unity version is equal or greater.
+        /// </summary>
+        /// <param name="major">Minimum major version.</param>
+        /// <param name="minor">Minimum minor version.</param>
+        /// <returns><c>true</c> if the current Unity version is greater. Otherwise <c>false</c>.</returns>
+        public static bool IsVersionOrGreater(int major, int minor)
+        {
+            return UnityVersion.Major > major || (UnityVersion.Major == major && UnityVersion.Minor >= minor);
+        }
+
+        /// <summary>
+        /// The current Unity version major.
+        /// </summary>
+        public static readonly int Major;
+
+        /// <summary>
+        /// The current Unity version minor.
+        /// </summary>
+        public static readonly int Minor;
+    }
+}