[mythtv] Ticket #5653: Need MythPopupBox::showOkPopup() replacement

[Nigel Pearson]

> #5653: Need MythPopupBox::showOkPopup() replacement
> -------------------- 
> +-------------------------------------------------------
>  Reporter:  nigel   |       Owner:  ijr


Several of these calls were wrapped in qApp->lock()/unlock(),
presumably because we were calling from a thread which
was not the main UI thread.

Is MythScreenStack::AddScreen() 100% safe in this situation?
(I haven't seen problems yet, but my testing is limited)

If not, sending an event to the main window may be needed
(instead of the simple function I proposed in that ticket)

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