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/UOContent/Network/ProtocolExtensions.cs

@@ -39,11 +39,11 @@ namespace Server.Network
             if (ph.Ingame && state.Mobile == null)
             {
                 state.WriteConsole("Sent in-game packet (0xBFx{0:X2}) before having been attached to a mobile", packetID);
-                state.Disconnect();
+                state.Disconnect("Sent in-game packet before being attached to a mobile.");
             }
             else if (ph.Ingame && state.Mobile.Deleted)
             {
-                state.Disconnect();
+                state.Disconnect(string.Empty);
             }
             else
             {