Add system event for LiveTV Ended to compliment LiveTV Started

[hpx@…]

I have a crappy cable STB which has no power on/of IR code, just a power toggle. To get around this problem I have been using the rec pending & rec finished system events to execute a script that turns the STB on before a recording stops and off after it ends. This works well for standard recordings, but causes issues in a live TV situation as it tries to turn the STB off while changing channels.

To work around this problem I was using the LiveTV start event to know when to ignore record start/end events, but I needed a LiveTV end event to ensure the STB was powered off when exiting live TV mode. This patch adds that event.

[hpx@…]

Updated patch for this file to fix event being triggered on playback end

[hpx@…]

2nd patch added for tv_play.cpp to prevent the event from being triggered on playback end. It should only fire when leaving livetv mode.

[Stuart Auchterlonie]

Looks a nice clean patch. We should be able to get this one in no problem.

[hpx <hpx@…>]

In 6c32a5e4e18ed85752029abed7d3be3398cf5a1e/mythtv:

Refs #12453. Adds a LIVETV_ENDED system event.
This complements the existing LIVETV_STARTED event

Signed-off-by: Stuart Auchterlonie <stuarta@…>

[hpx <hpx@…>]

In a4530f20581785aa7706d29905f2d9c9cdbfb279/mythtv:

Refs #12453. Adds a LIVETV_ENDED system event.
This complements the existing LIVETV_STARTED event

Signed-off-by: Stuart Auchterlonie <stuarta@…>
(cherry picked from commit 6c32a5e4e18ed85752029abed7d3be3398cf5a1e)