Added calculation and storage of new isolation variables, with looser core track subtraction

Matthew Henry Klein requested to merge maklein/athena:newEgammaTrackIsoCore into 21.2

Adds new isolation calculations with updated track isolation core, and adds variables to electron smart-slimming list. Also, replaces a couple variables (only those not currently used in any recommendations) with the new versions.

Edited by Matthew Henry Klein

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