Added object type visibility to containers, search and depot view

We have lots of different object types and make heavy use of the container functionality, the issue we have currently is that it'd difficult to see child/parent object types. This patch addresses the issues we have by:

* Extending the container functionality by grouping containers by their type.  
* Adding the object type to the object overview depot page to make it easy to differentiate between objects of different types with similar names.
* Adding the object type to the object cell renderer so it's possible to see object types on the search results page.

Thanks