feat: Adds a memory mirrored ring buffer for networking. (#1533)

## Breaking Changes

Incoming packet registration signature has changed to:
```cs
delegate* void OnReceiveCallback(NetState state, SpanReader reader, int packetLength);

IncomingPackets.Register(int packetID, int length, bool ingame, OnReceiveCallback onReceive);
```

For example, an incoming packet handler signature would now look like this:
```cs
public static void SomeIncomingPacket(NetState state, SpanReader reader, int packetLength)
{
    // Parse the data
}
```

## Summary

Updates the network Pipe class to use a mirrored memory technique. This technique involves mapping the same physical memory to two contiguous virtual memory spaces so the byte buffer appears duplicated. This allows writing to a double-sized array to wrap around without the need for the `CircularBuffer` classes.

In practice this allows us to use `Span<byte>` as if the buffer was a regular array.


### Bug Fixes

- [X] Fixes bad fixed length string parsing

Projects/UOContent/Network/Packets/IncomingMovementPackets.cs

@@ -13,6 +13,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  *************************************************************************/
 
+using System.Buffers;
+
 namespace Server.Network;
 
 public static class IncomingMovementPackets
@@ -25,7 +27,7 @@ public static class IncomingMovementPackets
         // IncomingPackets.Register(0xF1, 9, true, TimeSyncReq);
     }
 
-    public static void NewMovementReq(NetState ns, CircularBufferReader reader)
+    public static void NewMovementReq(NetState ns, SpanReader reader)
     {
         var from = ns.Mobile;
 
@@ -71,14 +73,14 @@ public static class IncomingMovementPackets
         }
     }
 
-    public static void TimeSyncReq(NetState ns, CircularBufferReader reader)
+    public static void TimeSyncReq(NetState ns, SpanReader reader)
     {
         reader.ReadUInt64(); // Client Time?
 
         ns.SendTimeSyncResponse();
     }
 
-    public static void MovementReq(NetState state, CircularBufferReader reader, int packetLength)
+    public static void MovementReq(NetState state, SpanReader reader, int packetLength)
     {
         var from = state.Mobile;