This shows up to the user as a dropdown that lets them pick if the target actor should be "myself", "event causer", "aim target", etc.
Use this property any time your card can have a target actor on which it acts (for example, if your card causes damage, sends a message, etc).
Use getCardTargetActor to get the actor that this property evaluates to.
||string||Name of the property.|
||Extra property options.|