Set the game control keys to idle while the focus is on the UI!

[xparq]

• [ ] That would requires a defined "idle" state, too... Well, the defaults are kinda that, but it's not explicit yet.
• [ ] Only the keys, right? I mean it's all keys for now, but it could be a game controller too, with a joystick, and that should not be affected!
  • [ ] That's need some intelligence in the virtual controller so it knows about the difference...
  • [ ] And then a param. (flag) for update() to mask out unwanted input types/sources!