Adding outlines with platypus-style build

[eggplants]

Hello.

I often build a document with `reportlab.platypus.*`. But I could not find any reference of the way to add outlines with platypus like `canvas.addOutlineEntry`. Please let me know if there is a way to do that.

If it exists, I'm going to use it for my project:

https://github.com/eggplants/mkbook/blob/master/mkbook/mkbook.py

Thanks,

eggplants

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https://github.com/eggplants