fix: Adds packet logging (#836)

### Enabling Packet Logging
`[packetlogging on` and target the user.
Supports command modifiers such as:
`[online packetlogging on where accesslevel = player`

Logs are saved in `path/<ip address>/packets.log`. It is a simple append-format log with no date splitting.

Projects/UOContent/Network/NetworkCommands.cs

@@ -0,0 +1,60 @@
+using Server.Commands;
+using Server.Commands.Generic;
+using Server.Mobiles;
+
+namespace Server.Network
+{
+    public class PacketLoggingCommand : BaseCommand
+    {
+        public static void Initialize()
+        {
+            TargetCommands.Register(new PacketLoggingCommand());
+        }
+
+        public PacketLoggingCommand()
+        {
+            AccessLevel = AccessLevel.Developer;
+            Commands = new[] { "PacketLogging" };
+            ObjectTypes = ObjectTypes.Mobiles;
+            Supports = CommandSupport.AllMobiles;
+            Usage = "PacketLogging <on|off>";
+            Description = "Enables or disables packet logging for a particular user until they disconnect.";
+        }
+
+        public override void Execute(CommandEventArgs e, object targeted)
+        {
+            if (e.Arguments.Length == 0)
+            {
+                LogFailure("Format: PacketLogging <on|off>");
+                return;
+            }
+
+            var from = e.Mobile;
+            var enable = Utility.ToBoolean(e.Arguments[0]);
+
+            if (targeted is not PlayerMobile pm)
+            {
+                LogFailure("That is not a player.");
+            }
+            else if (pm.NetState == null)
+            {
+                LogFailure("The player is not connected.");
+            }
+            else if (from != pm && from.AccessLevel < pm.AccessLevel)
+            {
+                LogFailure("You do not have the required access level to do this.");
+            }
+            else
+            {
+                pm.NetState.PacketLogging = enable;
+                var enabled = enable ? "enabled" : "disabled";
+                CommandLogging.WriteLine(
+                    from,
+                    $"{from.AccessLevel} {CommandLogging.Format(from)} {enabled} packet logging for {pm.Account.Username} ({pm.NetState})"
+                );
+
+                AddResponse($"Packet logging has been {enabled} for {pm.Account.Username} ({pm.NetState})");
+            }
+        }
+    }
+}