[PVR] Feature: Confirm shutdown if PVR backend is not idle.

User story: In case shutdown is requested by the user while PVR is recordig or a  recording will start very soon (and XBMC machine potentially cannot restart fast enough), XBMC refuses to shutdown, but shows a Yes/No dialog to the user explaining that PVR is currently not idle and asking the user to shut down anyway. If user does nothing for 10 secs, the dialog will autoclose and shutdown will be cancelled.

Purpose: This is very useful to prevent accidentally stopped recordings.

BTW: This feature has been discussed from time to time in the forums and there were some (hacky) addons around to implement this, but no clean implementation (which IMO can only be done inXBMC itself.)
> I have a more matured solution outside of xbmc which manages the HTPC in cases like wake up for recordings, inactivity powerdown, etc. I need an option to disable this.

> Okay. Shall I reintroduce the gui setting, defaulted to deactivate the feature?

Sorry, but you'll have to convince me that we need a setting to prevent a one time dialog on shutdown.

All this does (or should do once it's changed) is asking the user if he really wants to shut down and interrupt a running recording. Even with your external management of system power, you will still interrupt the recording when you shut down the system?