HttpListener's chunk size parsing could be more strict

Line 291 in 8c61077

    
           _chunkSize = int.Parse(RemoveChunkExtension(_saved.ToString()), NumberStyles.HexNumber, CultureInfo.InvariantCulture);

This might eat whitespace instead of rejecting it.
This is a better check:

Line 333 in 8c61077

    
           if (!Utf8Parser.TryParse(currentLine, out ulong chunkSize, out int bytesConsumed, 'X'))

@karelz

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