the daemon now sends info about the system shutdown progress: a list of
important services which may require up to several minutes to stop such
as lnd lightning daemon and bitcoin core.
see next commit for how this info is displayed and used by the GUI.
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passed 60 sec of no touch screen activity, daemon turns off backlight
and gui places a black "topdrop", opposite of backdrop. simply touching
the screen reactivates it immediately.
there seem to be no way to turn screen power off, so backlight plus
black topdrop is the next best.
there's no user settings to change 60 sec timeout at the moment because it
is unclear whether it's worth adding UI elements. can always do so later.
the implementation also provides means to reactivate the screen in
an event of an alert from the daemon in the future.
closes #3