Remove temporary buffers when marshalling objects

When marshaling object (nested too), most of the code has the following pattern

ByteArrayOutputStreamEx buffer = new ByteArrayOutputStreamEx();
TagWriterImpl nestedCtx = TagWriterImpl.newInstance(ctx, buffer);
marshallerDelegate.marshall(nestedCtx, null, t);

The TagWriterImpl class has an internal byte[] to minimize the invocations in the OutputStream. But, in the scenario above, there is no penailty to invoke the ByteArrayOutputStreamEx multiple times.