fix: Fixes crashing due to bad packet assumptions. (#1829)

### Summary
- Fixes various exploits that can crash the shard when the client misbehaves.
- Clients will now be disconnected if they send packets that are marked as out of game only (new flag), while they are in-game.


> [!Note]
> **Developer Note**
> Added an `OutOfGameOnly` which should be used to flag packets as only available out of the game.
> This is the opposite of, yet not the converse to `InGameOnly`.

Projects/UOContent/Network/FreeshardProtocol.cs

@@ -14,6 +14,7 @@
  *************************************************************************/
 
 using System.Buffers;
+using System.Runtime.CompilerServices;
 
 namespace Server.Network
 {
@@ -27,8 +28,14 @@ namespace Server.Network
             _handlers = ProtocolExtensions<FreeshardProtocolInfo>.Register(new FreeshardProtocolInfo());
         }
 
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static unsafe void Register(int cmd, bool ingame, delegate*<NetState, SpanReader, void> onReceive) =>
-            _handlers[cmd] = new PacketHandler(cmd, 0, ingame, onReceive);
+            Register(cmd, ingame, false, onReceive);
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static unsafe void Register(
+            int cmd, bool ingame, bool outgame, delegate*<NetState, SpanReader, void> onReceive
+        ) => _handlers[cmd] = new PacketHandler(cmd, onReceive, inGameOnly: ingame, outGameOnly: outgame);
 
         private struct FreeshardProtocolInfo : IProtocolExtensionsInfo
         {