* Use correctly scaled radial deadzones instead of naive per-axis
deadzones
* Option to adjust the "maximum zone" (upper deadzone)
* Option to remap square input into circular. Unfortunately there's no
nice way to detect which type the controller reports. We assume
circular by default.
* A more sensible sensitivity setting
* Use a larger minimum deadzone when emulating key presses (e.g. in
menus)
* Adjusted key repeat to be less aggressive
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