Copy Aetheria Code

Added a bunch of code from the old Aetheria project

Assets/Scripts/MessagePack/StringEncoding.cs

@@ -1,31 +0,0 @@
-// Copyright (c) All contributors. All rights reserved.
-// Licensed under the MIT license. See LICENSE file in the project root for full license information.
-
-using System;
-using System.Diagnostics;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-using System.Text;
-
-namespace MessagePack
-{
-    internal static class StringEncoding
-    {
-        internal static readonly Encoding UTF8 = new UTF8Encoding(false);
-
-#if !NETCOREAPP2_1 // Define the extension method only where an instance method does not already exist.
-        internal static unsafe string GetString(this Encoding encoding, ReadOnlySpan<byte> bytes)
-        {
-            if (bytes.Length == 0)
-            {
-                return string.Empty;
-            }
-
-            fixed (byte* pBytes = bytes)
-            {
-                return encoding.GetString(pBytes, bytes.Length);
-            }
-        }
-#endif
-    }
-}