Refs #14970, fixing merge conflicts

Conflicts:
	Framework/Geometry/inc/MantidGeometry/Crystal/SymmetryOperation.h
	Framework/Geometry/inc/MantidGeometry/Crystal/SymmetryOperationSymbolParser.h
	Framework/Geometry/src/Crystal/SymmetryOperation.cpp

clang-tidy: modernize-use-default

Engin-X full calibration improvements

Replace raw owning pointers with unique_ptr in Properties

re #15289

# Conflicts:
#	Framework/DataHandling/src/GroupDetectors.cpp
#	Framework/DataHandling/src/GroupDetectors2.cpp
#	Framework/DataHandling/src/LoadMuonNexus.cpp
#	Framework/DataHandling/src/LoadRaw3.cpp
#	Framework/DataHandling/src/LoadRawBin0.cpp
#	Framework/DataHandling/src/LoadTOFRawNexus.cpp
#	Framework/DataHandling/src/MaskDetectors.cpp
#	Framework/LiveData/src/ISISHistoDataListener.cpp
#	Framework/LiveData/src/StartLiveData.cpp
#	Framework/LiveData/test/ISISHistoDataListenerTest.h

change specid_t to specnum_t it was a source of confusion

Use std::array when possible

Require boost 1.53

Changes suggested by readability-simplify-boolean-expr fixed

Remove qt3 from Table widget in MantidPlot

SWANS loader

re #15450

Purge never built files from Framework.

Repleace Poco::Mutex, Poco::FastMutex with elements from header <mutex>

Fixing bug in validation of characterization run numbers

Remove scons-local from installers/WinInstall directory

Update SANS solid angle correction and docs

re #15450
# Conflicts:
#	Framework/API/inc/MantidAPI/MatrixWorkspace.h
#	Framework/API/src/MatrixWorkspace.cpp
#	Framework/Algorithms/src/GeneratePeaks.cpp
#	Framework/Algorithms/src/GetEi.cpp
#	Framework/DataHandling/inc/MantidDataHandling/EventWorkspaceCollection.h
#	Framework/DataHandling/src/EventWorkspaceCollection.cpp
#	Framework/DataHandling/test/LoadISISNexusTest.h

re #15450