Avoid error due to deprecated ICM option

[lobis]

In the latest release of Geant4 (v11.1.0) the ICM option appears to be deprecated, as it can be read in the release notes.

I have never used this option, I would love to know if anyone has some insight in this topic.

I modified the code to maintain compatilbity with older (10.4.3) version (I am not a fan of all this branching with #ifdef but...). I attempted to keep the original funtionality of the ICM option in my changes but I am not sure how to check it works correctly, or if it was working correctly in the first place anyway.

[jgalan]

I don't think anyone will launch new simulations with Geant4 10.4. At least with the latest rest versions.

./installGeant4.sh scripts dictates the recommended version.

[lobis]

I don't think anyone will launch new simulations with Geant4 10.4. At least with the latest rest versions.

./installGeant4.sh scripts dictates the recommended version.

Yes but we still need to maintain compatibility right? that why we need to do all these branching. The pipeline explicitly tests the current version of the framework / restG4 works with 10.4.3 as it was decided at the time.

Anyway since I don't know how to check if this works correctly and probably nobody is using this option, I just added a comment to point to any future user to post an issue if this is a problem, or perhaps we could disable the option entirely.

[glorialuzon]

I also have no experience with this "ICM" . Let's try to keep like that way for compatilbity with older geant4 versions