fix: Fixes stalled connections and infinite throttle (#1796)

> [!Warning]
> **Developer Warning**
> The `PacketThrottle` callback return value is now reversed. `true` indicates the connection is _throttled_.

### Summary
- Fixes an issue where connections get stalled forever
- Fixes an issue where the throttler is not working properly
- Removes account attack limiter
- Rewrites IP limiter
- Removes IP restrictions (they weren't used, and not practical)
- Fixes issue where IP limiter was counting before firewall was blocking.

View without whitespace:
https://github.com/modernuo/ModernUO/pull/1796/files?diff=split&w=1

Projects/Server/Network/NetState/NetState.cs

@@ -823,9 +823,9 @@ public partial class NetState : IComparable<NetState>, IValueLinkListNode<NetSta
         var throttler = handler.ThrottleCallback;
         if (throttler != null)
         {
-            if (!throttler(packetId, this, out bool drop))
+            if (throttler(packetId, this))
             {
-                return drop ? ParserState.Throttled : ParserState.AwaitingNextPacket;
+                return ParserState.Throttled;
             }
 
             SetPacketTime(packetId);