%Net.ChunkedWriter provides an interface so that its sub class may be used as an
%Net.HttpRequest EntityBody for chunked output from %Net.HttpRequest.
In order to do chunked output from %Net.HttpRequest, a subclass of %Net.ChunkedWriter
must be created which implements the OutputStream method. This subclass of %Net.ChunkedWriter
is then assigned to the EntityBody property of %Net.HttpRequest which uses
the OutputStream method of this class to produce the chunked output.
If the entire request body fits in one buffer, OutputStream is implemented by
If the entire request is multiple buffers, then WriteFirstChunk(buffer) is called
followed by 0 or more calls to WriteChunk(buffer) followed by a call to WriteLastChunk(buffer).
WriteLastChunk may be called with the last buffer of output or with the empty string
as its argument if no more output is required.
The TranslateTable property may be set to force automatic translation of the chunks as
they are written.