Remove RCBase from PixelDiodeMatrix and use std::shared_ptr instead (ATLASRECTS-5130)

• Remove RCBase from PixelDiodeMatrix.
• Use enable_shared_from_this to return shared_ptr of this poiter.
  • https://en.cppreference.com/w/cpp/memory/enable_shared_from_this/enable_shared_from_this
• Use std::shared_ptr instead of (const) PixelDiodeMatrix*
• https://its.cern.ch/jira/browse/ATLASRECTS-5130
• RunTier0Tests.py with with Athena master gcc8 2019-09-16T2129 found some differences in electron related variables. But I think we can ignore them.
  • RunTier0Tests.log
  • diff-root-q221.RDO.log
  • diff-root-q221.ESD.log
  • diff-root-q221.AOD.log
  • diff-root-q431.ESD.log
  • diff-root-q431.AOD.log

Irreproducibility is seen in identifierOfFirstHit of xAOD::TrackParticleAuxContainer_v4 with r17 with the changes. The irreproducibility is not seen with vanilla r17.

More packages (package_filters.txt) were recompiled with r18. RunTier0Tests.py is running to see if the irreproducibilies is fixed by the recompilation. --> Irreproducibility was not seen in q221 and q431 tests.