Implement absolute joystick input mode and add option to settings (closes #2612).
The sensitivity is unused in absolute mode, hence the option is hidden when absolute mode is enabled.
The tolerance works just like with relative input. All joystick inputs with smaller length are ignored. I did not implement it to snap back to the player in that case, because that would make alternate mouse input impossible and does not have any benefits IMO.
Settings page:
![screenshot_2020-10-10_1...