improve `Distortion` - Githubissues

Full-Wave Rectification ( i.e f(x) = abs(x) )
Half-Wave Rectification ( i.e f(x) = x < 0.0 ? 0.0 : x )
Infinite Clipping ( i.e f(x) = x < 0.0 ? -1.0 : x > 0.0 ? 1.0 : 0.0 || Math.signum(0.0f) )
Hard Clipping ( i.e f(x) = x > t ? t : x < -t ? -t : x (t=threshold) )
Soft Clipping Cubic ( i.e f(x) = x - s * pow(x, 3) (s=scaling_factor=[0,1]=default:0.33) )
Soft Clipping Arc Tangent ( i.e f(x) = (2.0 / PI) * atan(a*x) (a=amount=[1,10]) )
Bit Crushing ( i.e f(x) = floor(x * s) / s (s=steps=pow(2,bits-1)) ) ( instead of floor useround` )

dennisppaul / wellen