consider removing typing to increase compatibility

[AntiSol]

Hello,

Thank you for this plugin, it's exactly what I was looking for..........almost.

I was able to make this work with blender 2.8 with minimal changes, mostly removing new-style type annotations like list[x], use of typing union operator |, and one place where you're using a case statement. See: here

You should consider using less bleeding-edge language features to increase compatibility for your code - not everybody can easily use the latest bleeding-edge version of blender/python, and you gain nothing by using these features except making your code less compatible.

I've refrained from raising a PR because I think it's unlikely to get anywhere (and because I've simply removed typing rather than e.g using the typing library's Union/Dict/List/Tuple classes because I was in a hurry and because that's my preference), but I thought you might be interested. I'm happy to raise a PR if you'd like me to.