Do not use chunked transfer encoding on ASP.NET Core 2.1 #1016
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Setting the Content-Length header explicitly will disable chunked transfer-encoding. However this was only done for one of the two WriteMessageAsync methods in SoapMessageEncoder. I have changed the other method to also set the Content-Length header.
To do this I have used a MemoryStream. The other implementation used a StringWriter, which is not ideal, because it will convert to and from different encodings. We only want to find out the length of the stream, so a MemoryStream is faster and sufficient. Also changed the other WriteMessageAsync implementation to use a MemoryStream and removed the CustomStringWriter class.
Fixes #1015