gFEX Rho subtracted MET with LUT noise cut

Ava Anne Myersrequested to merge
amyers/athena:MET-Jan7 into 21.3

Add algorithms that compute Rho subtracted MET using a look up table rather than a dynamic RMS calculation. We configured the algorithm in addition to the existing, and also compute the variation using only positive towers to compute Rho.

Edited by Ben Carlson

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