This change unfortunately contains many single changes because it is an
update of the 3rd party component:

* Introduce new Parameter class for better serialization of containers
and other future enhancements
* Delete dead code
* Introduce user data in base archive class
* Fix minor source code issues and typos in comments
* Remove unused and conceptionally broken support of forward refernces
* Fix a memory leak in QXmlInArchive
* prefer load()/save() methods over stream operators
* throw exception on unsuported forward references in QXmlOutArchive
* refactor serialization of pointer types into own header
* remove unneeded specialisation for serialization of free functions
* check for default value of serialization using a getter

Change-Id: Ic197a92b00b22b85dab4a1b88c431cf4da8b3c3b
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>