Adjust configuration manager dialog

* Fulfill requests in LT-15450.
* Increase padding around top label.
* Modify descriptions of configuration and publication areas.
* Make selected configuration more obvious when not focused.
* Remove stock icon.

Change-Id: I45eba736a1106d302d4a170c18fd46dba4d57077
Add group boxes to configuration manager dialog

* And adjust padding of top label.
* Part of LT-15450.

Change-Id: Ia588e22b49befc24b93f102d83ad297cfca8f1f2