Midi Feedback about miditoobs HOT 4 OPEN

FYI I got both the button and fader feedback/bidirectional to work on X-Touch (regular one, not compact, not mini).

The first problem was assigning the proper output device, as it was not the same as input. I ended up adding mido.get_output_names() to the top of __main__ in setup.py. Turns out that output was the same as input, but with "1" instead of "0" at the end. I then set out_deviceID as per README. Side note: setup.py does not work with the output device configured because it tries to open it as input, so I have to remove it temporarily whenever I want the setup script to work.

To get faders to work I had to add "bidirectional": true manually in the json. They did move, but at an increasing offset the lower the value was. I spotted the Super dirty hack but @AlexDash says that it works that raises the volume value to a third degree before sending it to OBS, so I've added the reverse of that (volume = volume ** (1. / 3.)) right before the map_scale in volChanged

I've almost lost hope for getting this to work after trying 3 or 4 different plugins, thank you for this one!

I'm not sending a PR, because I'm not sure if that cube root makes sense for all devices, but as the power is used for all of them I guess it does?

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Re why cubic works: https://github.com/obsproject/obs-studio/blob/dde4d57d726ed6d9e244ffbac093d8ef54e29f44/libobs/obs-audio-controls.h#L44

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This is planned and on the to-do list, but on the very bottom because i don't have the hardware to develop with.

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I will see about adding fader feedback.

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