Improvements in mesh loading in blender importer

Just a short information :slight_smile:

I added the ability to load single lines and single points in mesh.
These should work like in blender: unshaded black material, with no UV’s and no other stuff that faces have.

This might be handy to spot lines and points that were left in the model by mistake.
Should also be able to load whole models made of lines - I came accross several of those.
And last thing about it: the vertex groups will be used in the future as constraints targets, so all of the vertices will be needed to properly compute the target’s position.

I hope the feature will not cause problems but if any occur - please inform me and I will try to fix it :wink: