ToolbarsExplorer updated for 2019.2, no py3 support yet

Alberto Buffolino

Hi all,
sorry if I disappeared, they are not great times.
I updated the add-on in subject for 2019.2, because various users reported problems about it.
Dev version is identical to stable, at the moment, but I hope to release soon a version ready for py3/2019.3.

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