Support line ending options

[SinghRajenM]

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[miloyip]

I think this can be done in output stream instead. Also, standard file i/o stream should already have conversion.

[SinghRajenM]

I think this can be done in output stream instead. Also, standard file i/o stream should already have conversion.

I am not pretty much sure about it.

But we are using StringBuffer to get prettier string. Something like below -

    rj::StringBuffer                                                                                      sb;
    rj::PrettyWriter<rj::StringBuffer, rj::UTF8<>, rj::UTF8<>, rj::CrtAllocator, rj::kWriteNanAndInfFlag> handler(sb);
    handler.SetLineEnding(le);
    handler.SetFormatOptions(lf);
    handler.SetIndent(indentChar, indentLen);
    
    rj::Reader       reader;
    rj::StringStream ss(jsonText.c_str());
    success = reader.Parse<someflags>(ss, handler) && sb.GetString();

Here, we are expecting that sb.GetString should provide pretty json with desired line ending option.

[SinghRajenM]

@miloyip Is there anything needed from my end to get this accepted and merged?