feat: add new context menu items

ChatTwo/Util/StringUtil.cs

@@ -0,0 +1,13 @@
+using System.Text;
+
+namespace ChatTwo.Util; 
+
+internal static class StringUtil {
+    internal static byte[] ToTerminatedBytes(this string s) {
+        var unterminated = Encoding.UTF8.GetBytes(s);
+        var bytes = new byte[unterminated.Length + 1];
+        Array.Copy(unterminated, bytes, unterminated.Length);
+        bytes[^1] = 0;
+        return bytes;
+    }
+}