add egamma TOB to Ntuple writer output

Tong Qiurequested to merge
tqiu/athena:tong-dev into master

  1. Add values in the e-gamma TOBs to the Ntuple writer output of the eFEX simulation.

  2. Add doxygen docstring to eFEXNtupleWriter and eFEXOutputCollection class.

Edited by Tong Qiu

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