Add ENet thirdparty

Source/ThirdParty/enet/enet License.txt

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+The MIT License (MIT)
+
+Copyright (c) 2002-2016 Lee Salzman
+Copyright (c) 2017-2021 Vladyslav Hrytsenko, Dominik Madarász
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Source/ThirdParty/enet/enet.Build.cs

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+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+using System.IO;
+using Flax.Build;
+using Flax.Build.NativeCpp;
+
+/// <summary>
+/// https://github.com/zpl-c/enet
+/// </summary>
+public class ENet : DepsModule
+{
+    /// <inheritdoc />
+    public override void Init()
+    {
+        base.Init();
+
+        LicenseType = LicenseTypes.Custom;
+        LicenseFilePath = "enet License.txt";
+
+        // Merge third-party modules into engine binary
+        BinaryModuleName = "FlaxEngine";
+    }
+
+    /// <inheritdoc />
+    public override void Setup(BuildOptions options)
+    {
+        base.Setup(options);
+
+        var depsRoot = options.DepsFolder;
+        options.PublicDefinitions.Add("ENET");
+    }
+}