Remove improper use of cfg file by multiple imports

[Danfoa]

This commit removes the multiple imports to the configuration file from different modules within the pipeline.

This hinders the hability to customize the system's configuration, since each submodule is reloading a fixed / outdated configuration

[giulioturrisi]

Hi! This is much needed, i know... I think that many other import are hidden inside the gradient and sampling mpcs, so this need still some rework

[Danfoa]

I checked and removed all cfg imports on the project and outside of the simulation script.