MSP Export 2013 compatibility

[fabiojpoli]

After fix the MSP Export for 2019 version (https://github.com/bryntum/bryntum-suite/pull/2274/files), the 2013 version is not working as was before.

Suggestion is create a condition to work for 2013:
If config version is about 2019 version, apply the changes about pull request above, because the version 2013 was working before that.

2013 currently (after pull request changes above):

[fabiojpoli]

Version parameter created.

@arcady-zherdev , please test on the branch 1745-... with your MS Project 2013 version. To do that, please change the exporter configuration at Gantt/examples/msprojectexport/app.js:

const gantt = new Gantt({
    features : {
        mspExport : {
            msProjectVersion : 2013
        }
    },
    ...
});

If there is any problem, please assign it back to me with the screenshot problem. Thank you!

[fabiojpoli]

According Arcady tests, looks good, data matches: