Updat of some HLT filters for Egamma paths entering in 73X

- dZ filter adapted to work with RecoEcalCandidates (HLTrigger/filters)
- Added a templated and more general version of PFMT filter (HLTrigger/Egamma)
- Added FED producer for Single Electron path to be used in the ECAL calibration stream (Calibration/EcalAlCaRecoProducers)
- Updated Filter to to perform the selection in regions of pseudo rapidity for the barrel and endcap in pi0/eta calibration paths (HLTrigger/special)
But not if that means duplicating verbatim a large body of nearly
unchanged code!