Nyall Dawson 679797e22b [FEATURE] New simplify + smoothing expression functions
Exposes simplification and smoothing algorithms to expression
engine, via:

- simplify(): applies Douglas-Peucker geometry simplification
- simplify_vw(): applies Visvalingam-Whyatt geometry simplification
- smooth(): smoothes a geometry

Carto tip: use smooth along with geometry generators to minimise
the typical "GIS" noded look of rendered geometries!
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if
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iqr
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q1
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q3
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sum
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x
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y
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