Remove always True flag

[nachovizzo]

This also makes the C++ and Python pipelines closer, since C++ has no option to enable/disable preprocessing

I have no strong opinions, so we can decide whether to keep this config. I haven't realized that we never use it, as "preprocessing" is just cropping the min/max range of the cloud, so I'd say it is something we always want to do....

Let me know what you guys think

[benemer]

Yes, no need for that. It is anyway confusing to have min_range and max_range in the config and then not always using it.

Can be merged in my view!

[tizianoGuadagnino]

I love it <3