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/World/World.cs

@@ -172,6 +172,8 @@ namespace Server
 
                 ns.Send(buffer);
             }
+
+            NetState.FlushAll();
         }
 
         public static void Broadcast(int hue, bool ascii, string format, params object[] args)
@@ -569,9 +571,6 @@ namespace Server
 
             ++_Saves;
 
-            NetState.FlushAll();
-            NetState.Pause();
-
             WorldState = WorldState.Saving;
 
             m_DiskWriteHandle.Reset();
@@ -611,8 +610,6 @@ namespace Server
             }
 
             ThreadPool.QueueUserWorkItem(WriteFiles);
-
-            NetState.Resume();
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]