- split RequestForceClose and LocalForceClose options, as request force close is only available if connected.
- disable no close policy on dialog, as it locks the user in the dialog if no succesful close is initiated.
what this intended to do is keep the backing object QEChannelDetails alive until a result is obtained, to avoid
exceptions when emitting the result signal. this is now handled more robustly, the user can leave the dialog
without triggering exceptions later.