Improve pressure application on radius
Also:
- Interpolate with curveBasis instead of curveLinear
- Increase the default stroke radius to 5 from 1
Cherry-picked from erasure-intervals
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@ml5717 I think this was approved already but please take a quick look.
Update: One important consideration I had missed was that a pressure of 0.5 should not affect the stroke radius. I'm now using a quadratic which ensures this - see getPressureFactor()
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Edited by Nayeem Rahman