Refs #9051. Widgets for the new option
Refs #9051. Functionality for retrieving selected policy
Refs #9051. Update plotting code to use the new option
Refs #9051. Move plot hiding to more appropriate place

And disable it when using previous window
Refs #9051. Move the option retrieval stuff to settings tab code

Plus make it's value auto-saveable
Refs #9051. Merge branch 'feature/9051_muon_use_same_window' into develop

Conflicts:
	Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/MuonAnalysisOptionTab.h
	Code/Mantid/MantidQt/CustomInterfaces/src/MuonAnalysisOptionTab.cpp