Implementation of jFEX mapping framework for forward detector regions

Bitwise offline simulation software. This framework is essentially still fully disconnected from the rest of the ATLAS framework (it is slowly being integrated with some monitoring software).

Numerous changes required to implement the jFEX mapping for forward detector regions (i.e. above 2.5 eta).

This is an extension to existing code designed to perform a similar task for the barrel region and EMEC, but the forward region is far more complex so requires a little bit of array athletics.

There's also a small text cleanup for the eFEX mapping code in there.

@afaulkne @vasothil

This is a replacement MR for the failed MR (due to conflicts and GIT issues) here: !40246 (closed)

Trigger/TrigT1/L1CaloFEX/L1CaloFEXSim/CMakeLists.txt

-# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+# Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( L1CaloFEXSim )