QtPositioning should not depend in QtQml

The split of QtLocation into QtLocation and QtPositioning caused a split of the attached QtLocation QML module. Unfortunately the QtLocation QML module depends on types provided by the QtPositioning QML module. This affects the following classes:

• DeclarativeGeoLocation
• DeclarativeGeoAddress

Since a plugin cannot export the symbols the above two classes were moved into the QtPositioning C++ library. Unfortunately this creates a dependency of QtPositioning towards QtQml. In particular the QML_DECLARE_TYPE macro cannot be resolved without QML headers.

There are multiple choices to resolve the issue:

1. Leave the dependency in place (aka acceptable dependency)
2. Provide yet another library as helper for the QML modules
3. Convert geolocation and geoaddress into valuetypes which means QtLocation QML module doesn't require the symbols