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code mostly c&p-d from qmake (sync from qt).

use qset instead of qlist

(merge aa87b75910a99a26e7ec581aa38f8982fe231ad0 from qt)

just put the actions into an action group

Done based on new IQuickOpenFilter property, isHidden.

This change removes a number of wrong usages of the CppModelManager::documents()/document().