Adding FJ3 functionality:
- AliFJWrapper: interface to generic and constituent subtractor
- AliEmcalJetTask: flags to execute generic and constituent subtractor if requested + writing info to event and/or AliEmcalJet
- AliEmcalJet: variables for generic subtraction method (derivatives and subtracted jet shape) -> only implemented for jet mass
- AliJetShape: jet shape object inheriting from FunctionFromPseudoJet -> only implemented jet mass (AliJetShapeMass)