Revert "Revert "Merge remote-tracking branch 'origin/feature/10376_refl_ui_menu_bar'""

This reverts commit 2cb19d94abd8a2f9328411771350e80dde8bbc49.
Refs #10376 Disable Refl UI native menu bar on OSX
Refs #10376 Try creating menu bar programatically
Refs #10376 Create menu bar parentlessly on OSX
Merge branch 'feature/10376_refl_ui_menu_bar' into develop

Conflicts:
	Code/Mantid/MantidQt/CustomInterfaces/src/QtReflMainView.cpp
	Code/Mantid/MantidQt/CustomInterfaces/src/ReflMainViewPresenter.cpp