Update a FlowElement's property list This is used by elements that are only aware of their properites at a later stage, such as cloud request based FlowElements or FlowElements that change their properties later based on new datafiles.
A default dummy constructor is needed for there are classes inheriting this class deeper than 1-level of inheritance and calling parent::__construct() in their explicit constructors unfortunately intermediates do not define their own __construct() so the call propagates up to the base class FlowElement and fails. More...