Initial commit: Ananta CBT 4229938 private server with all fixes

Ananta.Server/Ananta.Core/Protocol/Client4229938/ClientBuild.cs

@@ -0,0 +1,12 @@
+namespace Ananta.Server.Protocol.Client4229938;
+
+/// <summary>
+/// Identifies the client ABI implemented by this protocol folder.
+/// This is not a private-server setting: supporting another build requires another protocol implementation.
+/// Trunk 4229938/4221361/4226719 keeps the 4229938 RPC ids verbatim (verified against the
+/// 4229938 ServerMessageProcId dump), so the protocol folder continues to serve it.
+/// </summary>
+internal static class ClientBuild
+{
+    internal const int Version = 4229938;
+}