fix(core): Tightens the network stack (#479)

- [X] Removes network pause/resume
- [X] Adds back packet profiler
- [X] Adds state machine to keep track and trace netstates
- [X] Changes NetState.Running back to using an interlock exchange
- [X] Adds preliminary packet throttling support


### Packet Throttling
- `[GetThrottle <packetId>` to get the delay in milliseconds for that packet
- `[SetThrottle <packetId> <delay>` to set the delay in milliseconds for that packet
The settings are saved to `Configuration/throttles.json`

Projects/Server/Mobiles/Mobile.cs

@@ -2711,7 +2711,7 @@ namespace Server
             if (m_NetState != null)
             {
                 m_NetState.CancelAllTrades();
-                m_NetState.Disconnect();
+                m_NetState.Disconnect($"Player {this} has been deleted.");
             }
 
             DropHolding();