Base implementation for eft lines in likelihood plots.
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GitLab application update is scheduled for major version 18.0 next Tuesday, August 26th starting at 17:30h (Geneva time). Check breaking changes under OTG0157227
With testing config in /afs/cern.ch/work/t/tolange/inference_master/inference/plots/eftlines.dat (use --eftlines FILEPATH in PlotLikelihoodScan (2D only))