Add basic XY bounding sphere culling#76
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A simple prepass to discard instances that would be "roughly" outside of the pathfinding include box:
-The XY extent of the bounding boxes of the instances and the pfIncludeBox are used to compute the radiuses of their respective bounding spheres
-If the spheres don't intersect, the instance is not added
This approach was chosen as checking for intersections between spheres is a simple distance check, compared to OBB intersections that require heavier computation.