Removes a callback added for a given event subscriber to a given event publisher and a given event.
Role:
This function makes the event subscriber resign its subscription to a given event publisher
for a given event and associated data.
Parameters:
iEventSubscriber
The event subscriber
iEventPublisher
The event publisher from which the callback iCallback
is to be removed
iPublishedEvent
The published event
iCallback
The identifier of the callback to remove.
Legal values: This identifier was returned by
the