Fix various QtQuick.* submodule docs

Fix various QtQuick.* submodule docs

- Create module index pages for QtQuick.Window, QtQuick.XmlListModel and
QtQuick.LocalStorage.
- Fix references to module names in docs so that docs for properties
  and methods are actually generated e.g. use "QtQuick.Window2" instead
  of "QtQuick2.Window".

There's no easy way to document Module APIs at the moment so the
QtQuick.LocalStorage documentation has been updated in a hacky way to
generate the correct method documentation.

Change-Id: I7b34e4b4ac794acffc6d198b98e2115ccf0fa9a6
Reviewed-by: Martin Jones <martin.jones@nokia.com>