fix: Adds packet logging (#836)

### Enabling Packet Logging
`[packetlogging on` and target the user.
Supports command modifiers such as:
`[online packetlogging on where accesslevel = player`

Logs are saved in `path/<ip address>/packets.log`. It is a simple append-format log with no date splitting.

Projects/Server/Buffers/CircularBuffer.cs

@@ -129,7 +129,7 @@ namespace System.Buffers
 
         public Span<T> GetSpan(int index)
         {
-            if (index < 0 || index > 1)
+            if (index is < 0 or > 1)
             {
                 throw new ArgumentOutOfRangeException(nameof(index));
             }