XmlListModel is the only feature inside QtDeclarative which depends on
the QtXmlPatterns module, move this item to a separate plugin can reduce
the unnecessary dependency in most use cases.
To use the new XmlListModel, an additional "import QtQuick.xmllistmodel 2.0" is
needed.
Task-number:QTBUG-22158
Change-Id: I9e19eb6cbba46cd40fb7ffcdbd741f346779a54d
Reviewed-by: Yunqiao Yin <charles.yin@nokia.com>