TurnOffActivity for Devices, not just Activities [FEATURE]
**Is your feature request related to a problem? Please describe.**
So I've been trying to find more and more ways to streamline my Harmony setup with regard to HomeKit/HomeBridge to make it a tad less clunky, and I was finally onto something! Use activities as this plugin was generally intended. So that was going well, until I found out that 2 activities cannot run in tandem. Namely, when I turn on the activity to get ready to play a game, the activity that gives me an actual On/Off for my Air Conditioner turns off, thus turning my air conditioner off, which on these hot summer days, is not fun.

**Describe the solution you'd like**
What I'd be hoping for, if technically possible, is to have commands, or at the very least, PowerToggle commands, to show TurnOffActivity. Of course I understand that if a device is toggled without HomeKit, that the reflected state will not be accurate.

**Describe alternatives you've considered**
I did consider incorporating my Air Conditioner into each and every activity, but not only would that inevitably turn off the Air Conditioner when the activity ends, it would be less than practical during the other three seasons.

If this is possible at all, that would be awesome, and I would be eternally grateful, as this would allow me, and I'm sure others to reach peak efficiency with greater accuracy on their HomeKit setups! Hope this all made sense.