randGauss with fcs rand engine, replace hardcoded numbers with const vars, use impact cell info except eta/phi configuration, find eta/phi index with LArEM_ID

Files with identical content (same SHA1) but different file permissions
cause confusing differences shown in GitLab. The file permissions of
68 files were set to 644 (ATLINFR-2011).

FW-like Code Compatibility

See merge request atlas/athena!16769

Former-commit-id: d4267cc746f41923459e4b3a71d85dbc04467bc8

Sweeping !15419 from 21.2 to 21.0.
Fix MET_Truth muon selections for IntOut and IntMuons terms

See merge request atlas/athena!15481

Former-commit-id: 581598068e8731c7d5677f749b32b1b8cf8756bd

Merge 21.1 into 21.0

See merge request atlas/athena!16537

Former-commit-id: 38d19ff217b60dfc9546b1dd2f2e26abc50f095e

Fixed the bug addressed in Jira ticket FTKSIM-94 (https://its.cern.ch/jira/browse/FTKSIM-94). Fixed other firmware-like code compatibility issues in FTKSIM. Added comments on some lines. Also changed some print statements to FTKSetup::PrintMessage.


Former-commit-id: 2b6f6f1edca4303c792a5cef241b7faddaf620fd

Construct TFCSTruthState with negative mass for anti protons and anti neutrons

See merge request atlas/athena!16708

Former-commit-id: c34d8543700bf326c7dd04c38864a4c91546da93

Revert "Merge branch '21.0-TileJetMonTool-update' into '21.0'"

See merge request atlas/athena!16762

Former-commit-id: d23afb8be327fc82132ab5f0dc90e0c9d267bc35