Merge branch 'FTag-cleaning-for-Run3' into 'master'

...is/JetTagging/JetTagAlgs/BTagging/BTagging/BTagLabeling.h

...alysis/JetTagging/JetTagAlgs/BTagging/BTagging/BTagTool.h

...s/JetTagging/JetTagAlgs/BTagging/BTagging/IBTagLabeling.h

...icsAnalysis/JetTagging/JetTagAlgs/BTagging/CMakeLists.txt

...gging/JetTagAlgs/BTagging/python/BTaggingConfiguration.py

...agAlgs/BTagging/python/BTaggingConfiguration_LoadTools.py

...lysis/JetTagging/JetTagAlgs/BTagging/src/BTagLabeling.cxx

...sAnalysis/JetTagging/JetTagAlgs/BTagging/src/BTagTool.cxx

...g/JetTagAlgs/BTagging/src/components/BTagging_entries.cxx

PhysicsAnalysis/JetTagging/JetTagTools/CMakeLists.txt

...alysis/JetTagging/JetTagTools/JetTagTools/BTagVariables.h

...sis/JetTagging/JetTagTools/src/MultivariateTagManager.cxx