Use a sidebar instead of a modal for editing

One of the most frustrating things about BetterTouchTool's interface is that, once you get used to where everything is, it really starts to get in your way. The biggest way this happens is when editing widgets, where a modal takes over the entire app, preventing me from doing anything else while editing a widget.

So, please turn this:

Into this:

I stole Sketch's inspector sidebar to show what it would look like populated with a bunch of form fields.

Thank you! :slightly_smiling_face:

This is planned already :slight_smile:
It will probably be added with the upcoming midi device support, but that will still take a while unfortunately. Also it may not come to everything at once because it's quite a bit of work to implement.