Lifecycle events for classes

Classes need to have event handlers such as "create", "modify", and "remove" where script code is stored as part of the class and executed whenever an object experiences the appropriate change.

This should also extend to properties, perhaps the "modify" event should just receive parameters that indicate changes being applied. I also suggest a "validate" lifecycle event and accordant addition to the object editing interface.

List properties also need a "get list values" method for arbitrary lists.

Use cases include:

• integration of external services
• custom, dynamic list values
• validation of object data