[mythtv] Ticket #4571: Add popup menu to the main menu to allow shutdown

[Nigel Pearson]

> The main reason is that a xml menu button is very  easy to select
> accidentally.

True.

KnoppMyth gets around that by putting it in a
sub-menu "KnoppMyth", which has backup, restore,
power off, reboot, and a version display script.

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