Feature Request: Color and brightness sliders for Power-on behaviour for each light

[riahc3]

It would be nice for the Power-on behavior to have a slider such as this:

https://user-images.githubusercontent.com/1131521/51948661-aad73380-2429-11e9-8a69-f191755c8e01.png

Instead of having to fill in numeric numbers. I feel its a step back from most applications and WinHue itself already includes sliders