Nyall Dawson bcf9c828f9 [FEATURE][callouts] Add control over anchor point for callout on label
This gives users control over where a callout should join to the label
text. (Previously, you only had control over where the callout would
join to the corresponding feature geometry).

Choices include:
- Closest point (previous behavior)
- Label Centroid
- Fixed corners: Top left/top right/bottom left/bottom right/etc

Data defined control over the label anchor is also possible
2020-03-09 15:29:51 +10:00
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