Completed adding button monitor feedback for midi controllers

[ditcheshurt]

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I though it would be visually helpful for users of Midi controllers that have back-lit or otherwise feedback enabled button midi controllers to see what functions that have been activated by another function (monitoring) to create the same visual feedback you already have with the virtual console buttons.

I'm using an Akai APCMini for testing these changes and wanted to contribute to this amazing software and project.