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