Refs #8281 Tidy up the S(Q,w) interface on C2E.
Refs #8281 Hook up data selector widget to interface.
Merge branch 'feature/8281_sqw_interface_tidy' into develop

Refs #8281

Conflicts:
	Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/ConvertToEnergy.ui