Nyall Dawson f759c59334 [feature] New callout style for curved lines
Renders a nice cartographically pleasing curved line between the
labels and features.

Options include selecting a specific curve orientation (clockwise
or counterclockwise), or an automatic orientation option which
determines optimal orientation for each individual label. Users
also have control over the amount of curvature applied to the
callout lines.
2021-03-19 18:47:23 +10:00
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