Fix unsharpen API and f32 behavior#2887
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Partial fix for #2850. Basically the same as #2886, but for
unsharpen.Changes:
unsharpennow takes af32parameter between -1 and 1 for the threshold value.f32based.This makes the API consistent across subpixel types and fixes the behavior for f32/f64 images. I also fixed signed integer types in the process.
Downsides are similar as in #2886. It's slower for
u8+u16and there is precision loss due tof32, No rounding issues this time.