Auto-completion of QML imports

The auto-completed list of available imports and their versions seems hard-coded. Some imports, such as "Qt.labs.settings" is missing altogether. Furthermore, when creating a new project in Qt Creator, it doesn't matter whether one selects Qt Quick 1.x or 2.x, the auto-completer offers the exact same list of imports including incompatible imports. Please use the active kit for fetching available imports from and their latest available versions and offer those in the auto-completion. A separation between Qt Quick 1.x (QT_INSTALL_IMPORTS) and Qt Quick 2.x imports (QT_INSTALL_QML) is also needed - these two shouldn't be mixed in the same app.