add possibility to parse xmind2021 files #1
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Xmind2021 Update Request
Xmind2021 uses a content.json file instead of the previous used content.xml file to store the data of the xmind.
This pull request adds the option to parse xmind2021 files, while still working with older xmind files.
Changes in this pull request
I tried to stick to the 0.1 tag and update the Package.php file where necessary.