Started on UE4 server, semi working handshake

src/Prospect.Unreal/Core/FEngineVersion.cs

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+using Prospect.Unreal.Net;
+using Prospect.Unreal.Serialization;
+
+namespace Prospect.Unreal.Core;
+
+public class FEngineVersion
+{
+    public ushort Major { get; private set; }
+
+    public ushort Minor { get; private set; }
+
+    public ushort Patch { get; private set; }
+
+    public uint Changelist { get; private set; }
+
+    public string Branch { get; private set; }
+
+    public void Set(ushort major, ushort minor, ushort patch, uint changelist, string branch)
+    {
+        Major = major;
+        Minor = minor;
+        Patch = patch;
+        Changelist = changelist;
+        Branch = branch;
+    }
+
+    public void Deserialize(FArchive archive)
+    {
+        Major = archive.ReadUInt16();
+        Minor = archive.ReadUInt16();
+        Patch = archive.ReadUInt16();
+        Changelist = archive.ReadUInt32();
+        Branch = FString.Deserialize(archive);
+    }
+}