BTT Slider button/feature

@Andreas_Hegenberg @GoldenChaos Can you implement a custom button that works just like the native brightness and volume buttons found on the touchbar? I know its possible to build it using objective c, as in this [](http://github project), the creator was able to implement something like it onto the touchbar

The closest thing you can get in BTT is this:

(However there is currently a bug on T1 MacBook Pros which breaks the sliding)

thank you very much!