qqmljsimporter: resolve enums before other types

In qqmljsimporter, some comments hint that enums should be resolved before other types, but they are not in the presence of dependencies.

Concrete example, when importing Qt.Qml:

1. import the dependencies
   1. resolve the dependencies enums
   2. resolve the dependencies other types (fails!)
2. import QtQml itself
   1. resolve the module enums
   2. resolve the other types of the module

The step marked with "(fails!)" will not be able to resolve the method parameter flags in

QAbstractItemModel::match(...,Qt::MatchFlags flags)

as Qt::MatchFlags is only imported later: it lives in QtQml, not the dependency QtQml.Models where QAbstractItemModel lives.