Blender import/export for avarabsp

[assertivist]

Probably not super difficult, since our data is just a rearrangement of data from common APIs

https://github.com/avaraline/Avara/blob/master/bin/rsrc_tools/bspt/reader.py#L303-L337

I made this https://github.com/assertivist/avarabsp-blender-exporter a while ago, need to see if it actually works

[assertivist]

And if it does work, it should import too!