Draft: Implement the computation of the "mirror cell" for pile-up corrections
This MR implements two new functors "MirrorID" and "MirrorEnergy" to be applied on neutrals. These functors can be used to compute the pile-up energy corrections in the ECAL. See Chap 5 of https://cds.cern.ch/record/2886547?ln=en for more details.
Goes together with Rec!3847.
TODO:
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I think it's important to add an option to make this computation optional (and not performed by default), since it can be rather expensive. I am not sure how to do that
Edited by Camille Normand