TRTOverlay cleanup and modernisation

See merge request atlas/athena!21734

Add ATLAS_CHECK_THREAD_SAFETY to InDetRIO_OnTrack package and SCT_ClusterOnTrackTool class

See merge request atlas/athena!21635

CxxUtils: Add CachedUniquePtr; fix compilation/ubsan warnings.

See merge request atlas/athena!21706

Add ATLAS_CHECK_THREAD_SAFETY to SCT_GeoModel package

See merge request atlas/athena!21595

Revert "Merge branch 'master-jetchainconfig2' into 'master'"

See merge request atlas/athena!21752

AthenaPoolExampleAlgorithms: Update reference files.

See merge request atlas/athena!21748

InDetPrepRawData: Fix alignment of eigen objects for cling,

See merge request atlas/athena!21751

TrkExRungeKuttaIntersector: Suppress ubsan warnings from cling.

See merge request atlas/athena!21715

TrigOutputHandling: enable static thread checker

See merge request atlas/athena!21693

TileCalibAlgs: Migration of package to use private tools

See merge request atlas/athena!21618

Sweeping !21577 from 21.0 to master.
2018PbPb overlay config update

See merge request atlas/athena!21678

Private ToolHandles for PixelDigitization

See merge request atlas/athena!21567

Fix Tile simulation in AthenaMT (ATLASSIM-4053)

See merge request atlas/athena!21665

Update syntax used by ITRT_LocalOccupancy interface class

See merge request atlas/athena!21653

PsMap modified, handling of the Current Map is now thread-safe (ATLASSIM-4054)

See merge request atlas/athena!21727

Add ATLAS_CHECK_THREAD_SAFETY to InDetPrepRawData package and fix thread-safe issue.

See merge request atlas/athena!21616

Add ATLAS_CHECK_THREAD_SAFETY to InnerDetector/InDetRawEvent/InDetRawData package

See merge request atlas/athena!21604

athenaHLT: allow concurrent execution and other improvements

See merge request atlas/athena!21489

Add ATLAS_CHECK_THREAD_SAFETY to some Simulation packages

See merge request atlas/athena!21696

Add ATLAS_CHECK_THREAD_SAFETY to LArG4FCAL and LArG4HEC packages

See merge request atlas/athena!21701

Add ATLAS_CHECK_THREAD_SAFETY to InDetSimEventAthenaPool and InDetSimEventTPCnv packages

See merge request atlas/athena!21723

Add ATLAS_CHECK_THREAD_SAFETY to SCT_CalibAlgs package

See merge request atlas/athena!21720

Dropped redundant dependency on the EventInfo package from ALFA_Digitization

See merge request atlas/athena!21732

Dropped redundant dependency on the EventInfo package from AFP_Digitization

See merge request atlas/athena!21731

Dropped redundant dependency on the EventInfo package from ZDC_SimuDigitization

See merge request atlas/athena!21730

TrkPrepRawData: Fix alignment of eigen objects for cling.

See merge request atlas/athena!21750

Add ATLAS_CHECK_THREAD_SAFETY to InDetEventCnvTools package.

See merge request atlas/athena!21721

Dropped redundant dependency on the EventInfo package from TGC_Digitization

See merge request atlas/athena!21733

AthenaPoolMultiTest: Update reference files.

See merge request atlas/athena!21717

GeneratorObjects: Don't trip assertion in eventIndex for a null link.

See merge request atlas/athena!21749

DataModelRunTests: Remove ARA test.

See merge request atlas/athena!21746

TrkParametersBase: Fix ubsan warnings due to cling alignment.

See merge request atlas/athena!21713

TrkExSolenoidalIntersector: Fix ubsan warnings.

See merge request atlas/athena!21714