Initial Client/Server Communication

#1
Followed the MagicOnion quickstart guide, borrowing code from the chat sample app to get something working

Assets/Scripts/MessagePack/Internal/DynamicAssembly.cs

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+// Copyright (c) All contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+#if !(UNITY_2018_3_OR_NEWER && NET_STANDARD_2_0)
+
+using System;
+using System.Reflection;
+using System.Reflection.Emit;
+
+namespace MessagePack.Internal
+{
+    internal class DynamicAssembly
+    {
+#if NETFRAMEWORK // We don't ship a net472 target, but we might add one for debugging purposes
+        private readonly string moduleName;
+#endif
+        private readonly AssemblyBuilder assemblyBuilder;
+        private readonly ModuleBuilder moduleBuilder;
+
+        // don't expose ModuleBuilder
+        //// public ModuleBuilder ModuleBuilder { get { return moduleBuilder; } }
+
+        private readonly object gate = new object();
+
+        public DynamicAssembly(string moduleName)
+        {
+#if NETFRAMEWORK // We don't ship a net472 target, but we might add one for debugging purposes
+            AssemblyBuilderAccess builderAccess = AssemblyBuilderAccess.RunAndSave;
+            this.moduleName = moduleName;
+#else
+            AssemblyBuilderAccess builderAccess = AssemblyBuilderAccess.Run;
+#endif
+            this.assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(moduleName), builderAccess);
+            this.moduleBuilder = this.assemblyBuilder.DefineDynamicModule(moduleName + ".dll");
+        }
+
+        /* requires lock on mono environment. see: https://github.com/neuecc/MessagePack-CSharp/issues/161 */
+
+        public TypeBuilder DefineType(string name, TypeAttributes attr)
+        {
+            lock (this.gate)
+            {
+                return this.moduleBuilder.DefineType(name, attr);
+            }
+        }
+
+        public TypeBuilder DefineType(string name, TypeAttributes attr, Type parent)
+        {
+            lock (this.gate)
+            {
+                return this.moduleBuilder.DefineType(name, attr, parent);
+            }
+        }
+
+        public TypeBuilder DefineType(string name, TypeAttributes attr, Type parent, Type[] interfaces)
+        {
+            lock (this.gate)
+            {
+                return this.moduleBuilder.DefineType(name, attr, parent, interfaces);
+            }
+        }
+
+#if NETFRAMEWORK
+
+        public AssemblyBuilder Save()
+        {
+            this.assemblyBuilder.Save(this.moduleName + ".dll");
+            return this.assemblyBuilder;
+        }
+
+#endif
+    }
+}
+
+#endif