Reentrant and cacheable SpacePointFinder

...etector/InDetRecAlgs/SiSpacePointFormation/CMakeLists.txt

...ointFormation/SiSpacePointFormation/SiElementProperties.h

...ormation/SiSpacePointFormation/SiElementPropertiesTable.h

...rmation/SiSpacePointFormation/SiTrackerSpacePointFinder.h

...gs/SiSpacePointFormation/src/SiElementPropertiesTable.cxx

...s/SiSpacePointFormation/src/SiTrackerSpacePointFinder.cxx

...SiSpacePointTool/SiSpacePointTool/SiSpacePointMakerTool.h

...etRecTools/SiSpacePointTool/src/SiSpacePointMakerTool.cxx

.../SiTrigSpacePointFormation/src/SCT_TrigSpacePointTool.cxx

...rkEvent/TrkSpacePoint/TrkSpacePoint/SpacePointContainer.h

Tracking/TrkEvent/TrkSpacePoint/src/SpacePointContainer.cxx