AnnotationClustering
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Add `removeAnnotation` to QuadTree
removeAnnotation would find the given annotation leaf in the quadtree and remove it.
This would make it possible to
- remove annotations from the quadtree
- replace annotations in the quadtree (i.e. for moving map objects) via subsequent calls to
removeAnnotation&addAnnotation
Removing annotations would need to make sure that the tree stays balanced.