Add 2 new GenFilters for use by HI photon team #12511
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backport of #12510
These two gen filters for Pythia8 are meant to mimic the older ones used with Pyquen, which can be found here:
https://github.com/cms-sw/cmssw/blob/CMSSW_7_5_X/GeneratorInterface/HiGenCommon/src/EcalGenEvtSelector.cc
https://github.com/cms-sw/cmssw/blob/CMSSW_7_5_X/GeneratorInterface/HiGenCommon/src/EcalGenEvtSelectorFrag.cc
@bi-ran has done some sanity checking between the old filters and new filters which can be found here:
https://twiki.cern.ch/twiki/pub/CMS/MITHIGAnalysis2015/MCFilters.pdf
We would like to include these filters in the 75X series to be used for HI MC production.