Fixed trivial issues, mainly uninitialised members

Refs #10345
Fixed unchecked casts

Refs #10345
Correct initialisation order warnings

Refs #10345
Fix copy paste error in FitPropertyBrowser

This seemed to be a genuine error which affects the automatic
population of the X and Y columns in workspace settings group
of fit properties.

Refs #10345
Merge branch 'master' into bugfix/10345_coverity_issues_in_mantidqt

Conflicts:
	Code/Mantid/MantidQt/CustomInterfaces/src/JumpFit.cpp
	Code/Mantid/MantidQt/SpectrumViewer/src/SpectrumView.cpp

Refs #10345
Merge branch 'master' into bugfix/10345_coverity_issues_in_mantidqt

Conflicts:
	Code/Mantid/MantidQt/CustomInterfaces/src/IndirectDataReduction.cpp
	Code/Mantid/MantidQt/CustomInterfaces/src/JumpFit.cpp
	Code/Mantid/MantidQt/RefDetectorViewer/inc/MantidQtRefDetectorViewer/RefRangeHandler.h
	Code/Mantid/MantidQt/RefDetectorViewer/src/RefRangeHandler.cpp
	Code/Mantid/MantidQt/SpectrumViewer/src/GraphDisplay.cpp
	Code/Mantid/MantidQt/SpectrumViewer/src/RangeHandler.cpp
	Code/Mantid/MantidQt/SpectrumViewer/src/SpectrumDisplay.cpp
	Code/Mantid/MantidQt/SpectrumViewer/src/SpectrumView.cpp

Refs #10345
Merge remote-tracking branch 'origin/feature/10368_apply_corrections_preview_plot'
Merge branch 'master' into bugfix/10345_coverity_issues_in_mantidqt

Conflicts:
	Code/Mantid/MantidQt/CustomInterfaces/src/MSDFit.cpp

Refs #10345
Remove old variable from ApplyCorr constructor

Refs #10345
Merge branch 'bugfix/10345_coverity_issues_in_mantidqt' into develop