Moving karim to GitLab + making it more user friendly

[JanvanderLinden]

I think this framework produces a lot of problems for many users as it has a lot of parts where it can fail and it is hard to notice that it has failed. Also, after the change to nanoAOD setups most of the features here are not working anymore anyway.
Hence, I am searching for somebody to put in some effort to setup a new/updated framework (or just version of this framework) to replace this.

Some features I am looking for / ideas:

• moving it to GitLab
• making the submitting structure easier (automatic submits, saving meta info in workdir, customization of condor submits)
• checking job outputs more thorougly by using the meta info in the workdir (so that it doesnt require giving all of the 100 commandline options again)
• support for calcuation of weights and event variables (the only thing that works at the moment)
• evaluation of neural networks (GNNs and classification neural networks)
• genInfo -> recoObject assignment for NN trainings
• maybe moving the whole backend to RDataFrames (only possible if we can make sure the order of the events is retained)