ISIS-970: refactoring the Bulk.InteractionContext and BulkInteractionContext services: no longer does former inherit from latter...

... instead these are two separate services, with BulkInteractionContext renamed to ActionInvocationContext.

Refactored ToDoItem to use ActionInvocationContext rather than Bulk.InteractionContext
ISIS-970: moving the new ActionInvocationContext from applib.annotatoin to applib.services.actinvoc