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/Server/Text/TextEncoding.cs

@@ -115,7 +115,7 @@ public static class TextEncoding
         };
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private static bool IsSafeChar(ushort c) => c >= 0x20 && c < 0xFFFE;
+    private static bool IsSafeChar(ushort c) => c is >= 0x20 and < 0xFFFE;
 
     public static string GetString(ReadOnlySpan<byte> span, Encoding encoding, bool safeString = false)
     {