Custom actions on events

[gbakeman]

Based off of gawindx/WinNUT-Client#39

@FileCity

It should be a good idea, on a future release, to add the ability to run scripts when the UPS state is changing.
On battery = Script1.script
Back Online = Script2.script

More broadly, WinNUT may need a customizable events and actions system. This can configure notifications, and run a series of actions including custom scripts. I'm unsure how likely the full bredth of this idea will be made into the current version of WinNUT, versus the next generation.

• battery.voltage not supported by Synology DS923+ #144 : Perform stop action after waiting on battery power for x amount of time
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