Post #3434537

And now it's actually hooked up to the backend. There are a few things that don't work atm, like binding physical gamepad sticks, and I don't have validation (e.g. for things like binding the same physical control to multiple actions), layers or presets, but - overall it works. I reverted the controls preview for now, just so that the branch is smaller. At this point I have a fairly small list of things to do and I can land this in main (and then start filling the gaps like drawing the rest of the controllers one by one)