Add an kconf_update app to adapt to the contactlist.xml format changes

This kconf_update app updates the contactlist.xml file so that the model/view contactlist can lookup metacontacts via UUIDs. The metacontact id has been split into two fields: contactId which contains the new UUID for the contact and kabcId which will indicate which entry in kabc the contact is linked to.

No testing of the updating process through kconf_update has been done yet. The application does work from the command line though.