ControllerEmu: Improve and simplify UpdateCalibrationData. #9096
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Previously, the closest (by angle) calibration point was set to the distance of the provided input.
This produced slightly wrong calibration that would even draw outside of indicator square.
Clamping was done which hid the problem.
Now calibration is calculated from intersection with a line segment of the last two input values.
This is cleaner and more accurate.
Also the calibration shape is no longer restricted to a convex polygon.