Some work towards reverting to Qt 5.4.2 (#710) [ci skip].
Some work towards reverting to Qt 5.4.2 (#710) [ci skip].

Fairly/opencor,Fairly/opencor,mirams/opencor,Fairly/opencor,mirams/opencor,mirams/opencor,mirams/opencor,Fairly/opencor,Fairly/opencor,mirams/opencor