EgammaxAODHelpers add isFCal helper and tidy code. Use it in LargeClusterMaker and also tidy this one
This might be useful also for the upgrade where we have to treat the FCAL0 like EME2 for eta > ~ 3.2 in view of ITK coverage
upgrade
FCAL0
EME2
eta > ~ 3.2
ITK
ping @llewitt and @jdevivi