Mesh generators and objects

Created by: Durman

#2647 The situation is that most of generators don't take parameters on object level. Only parameters of first object are taking in account. It's logically not correct. I can't claim that it is useful for all generators but for some of them it should be. For example line generator I found useful for generation edges. On the picture I tried to recreate edges of NGon but instead got separate edges.

It would be nice to achieve some convention about what is proper way for mesh generation.