added classes for different designators as subclasses of CRAMDesignator
updated designator creation, use pre-defined desig name from Jan
added missing dependency
renamed launch files for roslog demo
added cram_add_desig_to_action/3 that allows to specify the property to link the action to the designator
fixed unit test: no pointing constraint for the pouring action any more
Allow default values for constraint properties to be overridden

By passing some of the arguments as atoms or bound variables, one can override their default values and only read those parts of the constraint that are not yet determined.
parse knowrob_mongo/Designator data type and convert it to iai_common_msgs/Designator