Implement Frame TV support
Hei,
I have prepared the plugin to implement the Art Mode support but i will need some help from people with Frame TVs since i don't have one.

I will tag everybody that i know it has a Frame TV :) @codyc1515, @JordanPatterson, @vhardono, @funkyremi, @mrMiimo, @soulcook, @jamesalmeida, @jackklink, @CGDaveMac

Since the last version now we also check the PowerState if the TV supports it! I will need from someone with a Frame TV to access `http://TV_IP:8001` or `http://TV_IP:8001/api/v2/` url while the **TV is in Art Mode** and tell me what value the PowerState key has.
<img width="465" alt="Screenshot 2021-03-10 at 12 50 30" src="https://user-images.githubusercontent.com/172068/110618443-6b9a7580-819f-11eb-9fea-65098a2b3431.png">


Also, i would like to ask you guys how do you see the flow and how it will be most useful for you?
The implementation sounds like this:
* Main accessory to toggle art mode. When the TV will be in art mode it will display as OFF!
* Separate switch where you can actually turn off the TV.
* Option to change default behaivor of main accessory and actually turn off the TV.
    * Add Art Mode as an Input option and display it in the main accessory when the TV is in art mode.
    * Separate switch where you can toggle the state of art mode

Let me know :)
The implementation will be made in steps. As soon as a step is done and tested, it will be released!

P.S. Without your help i will not be able to develop this feature.